SyntaxFix - Questions & Answers On All Programming Languages

Some Of The Best Answers From Latest Asked Questions

Flutter : Vertically center column

How to vertically center a column in Flutter? I have used widget "new Center". I have used widget "new Center", but it does not vertically center my column ? Any ideas would be helpful.... @override Widget build(BuildContext context) { return Scaf...

Angular 6: saving data to local storage

I have a data table which display data from external API, I want the number of items /element on the table page should be saved in local storage Here is what I have tried so far: ngOnInit() { this.moviesService.getPopularTVShows().subscribe(re...

How to change package name in flutter?

Is there any way to change Package Name of Flutter project? I want to change package name and application name in flutter project....

Rounded Corners Image in Flutter

I am using Flutter to make a list of information about movies. Now I want the cover image on the left to be a rounded corners picture. I did the following, but it didn’t work. Thanks! getItem(var subject) { var row = Container( margi...

Best way to "push" into C# array

Good day all So I know that this is a fairly widely discussed issue, but I can't seem to find a definitive answer. I know that you can do what I am asking for using a List, but that won't solve my issue. I teach a class in beginner C#. I have a PHP...

Problems after upgrading to Xcode 10: Build input file cannot be found

I upgraded my Xcode SDK to version 10 last night and then find I cannot build. I'm getting this error: Build input file cannot be found: '/Users/call01/Library/Developer/Xcode/DerivedData/Comp-Lite-Apps-gytvmossqptokeafrddvvmnlzadk/Build/Prod...

How to reload current page?

I have a page for editing user, it has some children components inside. Each children components can change or doing some effect to its parent component. So instead of emitting the changes to parent and updating some fields, I did a "reload" of the...

Command CompileSwift failed with a nonzero exit code in Xcode 10

Good afternoon, After updating to the latest version of Xcode at the moment (version 10.0) the project is unable to build because it found some errors regarding some "Command CompileSwift failed with a nonzero exit code" error. How do I solve this ...

Jenkins pipeline how to change to another folder

Currently i am using Jenkins pipeline script. For running one command, I need to access a folder outside its workspace directory. I tried sh "cd $workspace/", but it returned current workspace folder. How I can change to root workspace directory ...

PHP with MySQL 8.0+ error: The server requested authentication method unknown to the client

I'm running MySQL version 8 on PHP 7.0. I'm getting the following error when I try to connect to my database from PHP: Connect Error: SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client PHP might show this e...

Center content vertically on Vuetify

Is there a way to center content vertically in Vuetify? With the text-xs-center helper class, the content gets centered horizontally only: <v-container grid-list-md text-xs-center> <v-layout row wrap> <v-flex xs12> H...

I can't install pyaudio on Windows? How to solve "error: Microsoft Visual C++ 14.0 is required."?

I have a Windows 10 PC and I want to install pyaudio to use it with my chatbot, powered by chatterbot. I tried 2 different ways to install pyaudio. The first way is doing this on the command prompt: python -m pip install PyAudio This is the resu...

OpenJDK8 for windows

Im a bit confused about how to download openjdk8 for windows. If I go to http://openjdk.java.net/install/ then under JDK 8 there are only two sections: "Debian, Ubuntu, etc." and "Fedora, Oracle Linux, Red Hat Enterprise Linux, etc.". Where is windo...

GoogleMaps API KEY for testing

I'd like to add an API_KEY for GoogleMaps for testing and in documentation I've read this : Tip: During development and testing, you can register a project for testing purposes in the Google Cloud Platform Console and use a generic, unrestricted...

How to open a link in new tab using angular?

I have an angular 5 component that needs to open a link in new tab, I tried the following: <a href="www.example.com" target="_blank">page link</a> when I open the link, the application gets slow and opens a route like: localhost:4200/...

Support for the experimental syntax 'classProperties' isn't currently enabled

While I was setting up React within Django project I came across this error ModuleBuildError in Module build failed (from ./node_modules/babel-loader/lib/index.js): SyntaxError: C:\Users\1Sun\Cebula3\cebula_react\assets\js\index.js:...

How can I add shadow to the widget in flutter?

How can I add shadow to the widget like in the picture below? This is my current widget code. ...

System has not been booted with systemd as init system (PID 1). Can't operate

I'm trying to follow the Redis installation process as discuss in this article of digital ocean, in WSL. The Ubuntu version installed is Ubuntu 18.04. Everything in redis installation is fine but when I tried to run this sudo systemctl start redis I...

DeprecationWarning: Buffer() is deprecated due to security and usability issues when I move my script to another server

Getting error when script move to other server. (node:15707) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead. Cu...

Starting ssh-agent on Windows 10 fails: "unable to start ssh-agent service, error :1058"

When I try to start the ssh-agent on Windows 10 via PowerShell (with elevated right or without) by entering Start-Service ssh-agent I get the error unable to start ssh-agent service, error :1058 When I check of the service is running via Get-Se...

Getting all documents from one collection in Firestore

Hi I'm starting with javascript and react-native and I'm trying to figure out this problem for hours now. Can someone explain me how to get all the documents from firestore collection ? I have been trying this: async getMarkers() { const events ...

Flutter - The method was called on null

I'm programming an app that displays two media streams in the same view via one horizontal listView and one vertical listView. I'm currently working on implementing information into the bottom listView using some nice looking boilerplate that can be ...

Can I use library that used android support with Androidx projects.

I know, androidx and support dependency causing multidex error We can not use androidx and android support at a same time. So I totally migrate to androidx. but one of my dependency lib used android support "lottie". What can we do in above situatio...

Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'

This is the Warning im getting in console, Im confused with this warning: Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual lo...

ERROR Error: Uncaught (in promise), Cannot match any routes. URL Segment

I have simple navigation in angular 6 app, Here is HTML <nav class="main-nav> <ul class="main-nav__list " ng-sticky [addClass]="'main-sticky-link'" [ngClass]="ref.click === true? 'Navbar__ToggleShow' :''"> <li class="mai...

How to convert string to boolean in typescript Angular 4

I know am not the first to ask this and as I mentioned in my title ,I am trying to convert string value boolean . I have previously put some values into local storage,Now I want to get all the values and assign all to the some boolean variables . a...

What is the Record type in typescript?

What does Record<K, T> mean in Typescript? Typescript 2.1 introduced the Record type, describing it in an example: // For every properties K of type T, transform it to U function mapObject<K extends string, T, U>(obj: Record<K, T>,...

Flutter- wrapping text

I want wrap text as text grows. I searched through and tried wrap with almost everything but still text stays one line and overflows from the screen. Does anyone know how to achieve this? Any help is highly appreciated! Positioned( left: positi...

Iterating over arrays in Python 3

I haven't been coding for awhile and trying to get back into Python. I'm trying to write a simple program that sums an array by adding each array element value to a sum. This is what I have: def sumAnArray(ar): theSum = 0 for i in ar: ...

Could not install packages due to an EnvironmentError: [WinError 5] Access is denied:

I have windows 10. I have completed installing Tensorflow. It works. It says "Hello Tensorflow!". But it has all of this before it: 2018-08-18 18:16:01.500579: I T:\src\github\tensorflow\tensorflow\core\platform\cpu_feature_guard.cc:141] Yo...

How to allow all Network connection types HTTP and HTTPS in Android (9) Pie?

From Android 9 Pie now, requests without encryption will never work. And by default, the System will expect you to use TLS by default.You can read this feature here So if you only make requests via HTTPS you are safe. But what about apps that make re...

Flutter plugin not installed error;. When running flutter doctor

I am configuring Flutter SDK on my Linux Ubuntu 16.4 system. Why am I getting the following error when I run the flutter doctor? I have specified both PATHS for flutter and dart in the .bashrc but I get this error when I run flutter doctor Doctor sum...

How do I install opencv using pip?

I need to install cv2 for a script that has been written for me. I tried pip install cv2 and pip install open_cv and got the same problem - a warning message from dist.py and complains about zlib being not found. No cv2 installed. I also tried pyope...

Android Material and appcompat Manifest merger failed

I have next grade dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'com.android.support:appcompat-v7:28.0.0-rc01' implementation 'com.android.support.constraint:constraint-layout:1.1.2' test...

How to scroll page in flutter

My code for a page is like this. i need to scroll part below appbar. @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar(... ), body: new Stack( children: <Widget>[ new Con...

Find the smallest positive integer that does not occur in a given sequence

I was trying to solve a problem in Codility provided below, Write a function: class Solution { public int solution(int[] A); } that, given an array A of N integers, returns the smallest positive integer (greater than 0) that does not occur in A....

Select Specific Columns from Spark DataFrame

I have loaded CSV data into a Spark DataFrame. I need to slice this dataframe into two different dataframes, where each one contains a set of columns from the original dataframe. How do I select a subset into a Spark dataframe, based on columns ?...

Angular: How to download a file from HttpClient?

I need download an excel from my backend, its returned a file. When I do the request I get the error: TypeError: You provided 'undefined' where a stream was expected. You can provide an Observable, Promise, Array, or Iterable. My code is: t...

Waiting for another flutter command to release the startup lock

When I run my flutter application it show Waiting for another flutter command to release the startup lock this messages and not proceed further....

Has been blocked by CORS policy: Response to preflight request doesn’t pass access control check

I have created trip server. It works fine and we are able to make POST request by Insomnia but when we make POST request by axios on our front-end, it sends an error: has been blocked by CORS policy: Response to preflight request doesn’t pass acce...

Xcode 10.2.1 Command PhaseScriptExecution failed with a nonzero exit code

Showing Recent Messages:-1: mkdir -p /Users/spritzindia/Library/Developer/Xcode/DerivedData/Contigo-atftiouzrdopcmcpprphpilawwzm/Build/Products/Debug-iphonesimulator/Contigo.app/Frameworks Showing Recent Messages:-1: rsync --delete -av --filter P .*...

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory in ionic 3

When I run ionic 3 project using "ionic serve" command than getting this error: ...

How can I force component to re-render with hooks in React?

Considering below hooks example import { useState } from 'react'; function Example() { const [count, setCount] = useState(0); return ( <div> <p>You clicked {count} times</p> ...

What is the meaning of "Failed building wheel for X" in pip install?

This is a truly popular question here at SO, but none of the many answers I have looked at, clearly explain what this error really mean, and why it occurs. One source of confusion, is that when (for example) you do pip install pycparser, you first ...

No Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator

I am trying to consume an API using Retrofit and Jackson to deserialize. I am getting the onFailure error No Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator....

What is useState() in React?

I am currently learning hooks concept in React and trying to understand below example. import { useState } from 'react'; function Example() { // Declare a new state variable, which we'll call "count" const [count, setCount] = useSt...

Set the space between Elements in Row Flutter

Code: new Container( alignment: FractionalOffset.center, child: new Row( mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: <Widget>[ new FlatButton( child: n...

A fatal error occurred while creating a TLS client credential. The internal error state is 10013

Recently deployed a Windows 2016 Standard Server, with Active Directory and Exchange 2016. We have disabled SSL 1.0, 2.0 and 3.0 for both Server and Client, and have disabled TLS 1.0 and TLS 1.1. We are repeatedly getting the following entry in o...

How to call loading function with React useEffect only once

The useEffect React hook will run the passed in function on every change. This can be optimized to let it call only when the desired properties change. What if I want to call an initialization function from componentDidMount and not call it again on...

Angular CLI Error: The serve command requires to be run in an Angular project, but a project definition could not be found

When running the terminal commands ng server or ng serve --live-reload=true, I'm getting this issue: The serve command requires to be run in an Angular project, but a project definition could not be found. ...

Selenium: WebDriverException:Chrome failed to start: crashed as google-chrome is no longer running so ChromeDriver is assuming that Chrome has crashed

Recently I switched computers and since then I can't launch chrome with selenium. I've also tried Firefox but the browser instance just doesn't launch. from selenium import webdriver d = webdriver.Chrome('/home/PycharmProjects/chromedriver') d.ge...

must declare a named package eclipse because this compilation unit is associated to the named module

I just downloaded eclipse for Java Yesterday but when I was trying to get make my first program, I kept on getting this error: must declare a named package eclipse because this compilation unit is associated to the named module x. How do I fix t...

How to set width of mat-table column in angular?

Here in my mat-table have 6 column when any column has not more words then it looks like Image-1, but when any column has more words then UI looks like Image-2, so how to set UI like Image-1 when any column has more words in angular 6 ? Image-1 I...

expected assignment or function call: no-unused-expressions ReactJS

class Game extends Component { constructor() { super() this.state = { speed: 0 } //firebaseInit() } render() { return ( <div> <h1>The Score is {this.state.speed};</h1> &...

ImageMagick security policy 'PDF' blocking conversion

The Imagemagick security policy seems to be not allowing me perform this conversion from pdf to png. Converting other extensions seem to be working, just not from pdf. I haven't changed any of the imagemagick settings since I installed it... I am usi...

Could not install packages due to an EnvironmentError: [Errno 13]

In my MacOS Mojave terminal I wanted to install a python package with pip. At the end it says: You are using pip version 10.0.1, however version 18.1 is available. You should consider upgrading via the 'pip install --upgrade pip' command. So I wan...

Flutter: RenderBox was not laid out

I'm trying to create a ListView but when I import the list_form.dart class i get this error. Maybe I made some mistakes with the layout because if I try to run it inside the main file I don't get this error. This is the error: I/flutter (12956)...

Space between Column's children in Flutter

I have a Column widget with two TextField widgets as children and I want to have some space between both of them. I already tried mainAxisAlignment: MainAxisAlignment.spaceAround, but the result was not what I wanted....

WebView showing ERR_CLEARTEXT_NOT_PERMITTED although site is HTTPS

I'm starting to work on an app on Android, so I don't have much. All I have is just a WebView so far. I created the project in Android Studio, and my project got set as an Android InstantApp. I'm not sure why/how, but my guess is that I overlooked an...

OpenCV !_src.empty() in function 'cvtColor' error

I am trying to do a basic colour conversion in python however I can't seem to get past the below error. I have re-installed python, opencv and tried on both python 3.4.3 (latest) and python 2.7 (which is on my Mac). I installed opencv using python's...

ConvergenceWarning: Liblinear failed to converge, increase the number of iterations

Running the code of linear binary pattern for Adrian. This program runs but gives the following warning: C:\Python27\lib\site-packages\sklearn\svm\base.py:922: ConvergenceWarning: Liblinear failed to converge, increase the number of iterations. "t...

pod has unbound PersistentVolumeClaims

When I push my deployments, for some reason, I'm getting the error on my pods: pod has unbound PersistentVolumeClaims Here are my YAML below: This is running locally, not on any cloud solution. apiVersion: extensions/v1beta1 kind: Deploymen...

How to downgrade python from 3.7 to 3.6

I'm trying to install tensorflow but it needs a Python 3.6 installation and I only have Python 3.7 installed. I tried to switch using brew and pyenv but it doesn't work. Does anyone know of a way to solve this problem?...

Post request in Laravel - Error - 419 Sorry, your session/ 419 your page has expired

I installed Laravel 5.7 Added a form to the file \resources\views\welcome.blade.php <form method="POST" action="/foo" > @csrf <input type="text" name="name"/><br/> <input type="submit" value="Add"/> </form>...

How do I install Java on Mac OSX allowing version switching?

I want to install OpenJDK Java on Mac OSX and have it work alongside other JDK's since it is a newer release. Currently, I downloaded the tar.gz and placed it in my path but that is hard to maintain. The only other install I found that do more th...

Git is not working after macOS Update (xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools)

I updated to macOS Mojave (this happens on Catalina update too, and seems to potentially occur on every major update thereafter) This morning I navigated to my work's codebase in the Command Line on my MacBook pro, typed in "git status" in ...

How to install OpenJDK 11 on Windows?

In the past, Oracle used to publish an executable installers for Windows that would: Unpack files Add registry keys indicating the installed version and path Add the JRE to the system PATH Register an uninstaller with Windows. As of Java 11, the ...

Can't compile C program on a Mac after upgrade to Mojave

I have used the gcc command on the terminal to compile C programs but all of a sudden, after an update to my Mac's OS (to macOS 10.14 Mojave, and XCode 10.0), I started receiving the message: test.c:8:10: fatal error: stdio.h: No such file or direct...

How to install JDK 11 under Ubuntu?

So Java 11 is out. Does anybody know how to install it (OpenJDK from Oracle) from the command line? I would like to see something like it was before for Oracle Java 10: sudo add-apt-repository ppa:linuxuprising/java sudo apt-get update sudo apt-get...

Java 11 package javax.xml.bind does not exist

I'm trying to deserialize XML data into a Java content tree using JAXB, validating the XML data as it is unmarshalled: try { JAXBContext context = JAXBContext.newInstance("com.acme.foo"); Unmarshaller unmarshaller = context.createUnmarshaller();...

How to change status bar color in Flutter?

I am trying to change the status bar color to white. I found this pub on flutter. I tried to use the example code on my dart files....

WARNING: API 'variant.getJavaCompile()' is obsolete and has been replaced with 'variant.getJavaCompileProvider()'

Suddenly when Syncing Gradle, I get this error: WARNING: API 'variant.getJavaCompile()' is obsolete and has been replaced with 'variant.getJavaCompileProvider()'. It will be removed at the end of 2019. For more information, see http...

IntelliJ can't recognize JavaFX 11 with OpenJDK 11

I'm having trouble getting IntellJ to recognize JavaFX packages. With a new JavaFX project, with OpenJDK 11, when trying to build the project, IntelliJ can't recognize the JavaFX packages. I've imported openjfx:javafx-base-11 from the Maven repo. I...

Difference between OpenJDK and Adoptium/AdoptOpenJDK

Due to recent Oracle Java SE Support Roadmap policy update (end of $free release updates from Oracle after March 2019 in particular), I've been searching for alternatives to Oracle Java. I've found that OpenJDK is an open-source alternative. And I've...

Objects are not valid as a React child. If you meant to render a collection of children, use an array instead

I am setting up a React app with a Rails backend. I am getting the error "Objects are not valid as a React child (found: object with keys {id, name, info, created_at, updated_at}). If you meant to render a collection of children, use an array instead...

Xcode 10: A valid provisioning profile for this executable was not found

Since yesterday I've been getting the following error when trying run an app on my device: A valid provisioning profile for this executable was not found." This is after updating to Xcode 10. Building with Xcode 9 last week worked without issu...

What is "not assignable to parameter of type never" error in typescript?

Code is: const foo = (foo: string) => { const result = [] result.push(foo) } I get the following TS error: [ts] Argument of type 'string' is not assignable to parameter of type 'never'. What am I doing wrong? Is this a bug?...

Xcode 10, Command CodeSign failed with a nonzero exit code

Everytime I build console is showing this message. CodeSign /Users/admin/Desktop/AppStoreBuild/Project201/build/Debug-iphonesimulator/Project.app (in target: Desker) cd /Users/admin/Desktop/AppStoreBuild/Project201 export CODESIGN_ALL...

Receiving "Attempted import error:" in react app

I am receiving the following error when trying to run my React app: ./src/components/App/App.js Attempted import error: 'combineReducers' is not exported from '../../store/reducers/'. Here's how I'm exporting combineReducers: import { com...

JS file gets a net::ERR_ABORTED 404 (Not Found)

I am trying to create a simple Io-web-chat. I recently wanted to seperate my <script> inside my html file to an external js file. this is my very simple folder structure: Chat |-- index.html |-- index.js `-- server.js Relevant part of html...

React Hooks useState() with Object

What is the correct way of updating state, is a nested object, in React with Hooks? export Example = () => { const [exampleState, setExampleState] = useState( {masterField: { fieldOne: "a", fieldTwo: { fieldTwoOne: ...

Error: Java: invalid target release: 11 - IntelliJ IDEA

I am trying to build an application which was built using java 8, now it's upgraded to java 11. I installed Java 11 using an oracle article in my windows machine and I use IntelliJ IDEA 2017 as my IDE. I changed my system environment variables and s...

Requests (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.") Error in PyCharm requesting website

Using requests in Python3 Windows via Pycharm, and receiving SSL Module Not Available Error I've spent hours trying to figure out what could be causing this. I've reinstalled Anaconda, and I am completely stuck. When running the following def Early...

How to fix 'Unchecked runtime.lastError: The message port closed before a response was received' chrome issue?

I'm using VueJS and Laravel for my project. This issue started to show lately and it shows even in the old git branches. This error only shows in Chrome browser. ...

How to setup virtual environment for Python in VS Code?

In my project folder I created venv folder. python -m venv venv When I in VS Code run command select python interpreter my venv folder is not shown. I went one level up like suggested here but VS Code doesn't see my virtual interpreter. What did ...

useState set method not reflecting change immediately

I am trying to learn hooks and the useState method has made me confused. I am assigning an initial value to a state in the form of an array. The set method in useState is not working for me even with spread(...) or without spread operator. I have mad...

WARNING in budgets, maximum exceeded for initial

When build my angular 7 project with --prod, i have a warning in budgets. I have a angular 7 project, i want to build it, but i have a warning: WARNING in budgets, maximum exceeded for initial. Budget 2 MB was exceeded by 1.77 MB these are chunk ...

Git fatal: protocol 'https' is not supported

I am going through Github's forking guide: https://guides.github.com/activities/forking/ and I am trying to clone the repository onto my computer. However, running the command: $ git clone https://github.com/./Spoon-Knife.git Cloning into 'Spoon-Kni...

Can't perform a React state update on an unmounted component

Problem I am writing an application in React and was unable to avoid a super common pitfall, which is calling setState(...) after componentWillUnmount(...). I looked very carefully at my code and tried to put some guarding clauses in place, but the...

UnhandledPromiseRejectionWarning: This error originated either by throwing inside of an async function without a catch block

I am getting following error in my Node-Express App UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which wa...

Pylint "unresolved import" error in Visual Studio Code

I am using the following setup macOS v10.14 (Mojave) Python 3.7.1 Visual Studio Code 1.30 Pylint 2.2.2 Django 2.1.4 I want to use linting to make my life a bit easier in Visual Studio Code. However, for every import I have states "unresolved i...

How to make an AlertDialog in Flutter?

I am learning to build apps in Flutter. Now I have come to alert dialogs. I have done them before in Android and iOS, but how do I make an alert in Flutter? Here are some related SO questions: How to style AlertDialog Actions in Flutter adding dro...

dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.62.dylib error running php after installing node with brew on Mac

I installed node using homebrew (Mojave), afterwards php stoped working and if I try to run php -v I get this error: php -v dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.62.dylib Referenced from: /usr/local/bin/php Reason: image ...

React hooks useState Array

I tried looking for resetting useState array values in here but could not find any references to array values. Trying to change the drop down value from initial state to allowedState values. I am using hooks method here to set the values using setSt...

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