[xcode] error Failed to build iOS project. We ran "xcodebuild" command but it exited with error code 65

I've build a react-native application and suddenly I get this error message on my terminal during run of the command react-native run-ios. The same code work fine 10 minutes ago and suddenly I get this error message. Please help...

1. delete the build/ folder in ios/ and rerun if that doesn't do any change then
2. File -> Project Settings (or WorkSpace Settings) -> Build System -> Legacy Build System
3. Rerun and voilà!

In case this doesn't work, don't be sad, there is another solution to deeply clean project

1. Delete ios/ and android/ folders.

2. Run react-native eject

3. Run react-native link

4. react-native run-ios

This will bring a whole new resurrection for your project

In my case everything solved after re-cloning the repo and launching it again.

Setup: Xcode 12.4 Mac M1

For me it caused by installing react-native-vector-icons and linking by running the react-native link react-native-vector-icons command.

I just unlinked the react-native-vector-icons by following commands

1. react-native unlink react-native-vector-icons
2. cd ios
3. pod install
4. cd ..
5. react-native run-ios

As I already installed an other icon library.

What worked for me was to rename the project by removing the special characters.

Example: "project_marketplace" to "projectmarketplace"

In this case, I redid the project with react-native init and copied the src and package.json folder.

Should always start with the simplest first, after wasting hours and days on this error.

And after an extensive amount of research,

Simply

RESTART YOUR MACHINE

This resolved this error.

I'm on

react-native-cli: 2.0.1
react-native: 0.63.3

This could also be due to having custom named schemes, in that case:

• cd ios
• xcodebuild -list

Find your's, it might have a -dev suffix. Then:

• cd .. (root of the app)
• npx react-native run-ios --scheme custom-scheme-name

cd ios && rm Podfile.lock && pod install worked for me.

In my case, the issue was with my Xcode build scheme. When you run react-native run-ios you may see something like,

• info Found Xcode workspace "myproject.xcworkspace"*

• info Building (using "xcodebuild -workspace myproject.xcworkspace -configuration Debug -scheme myproject -destination id=xxxxxxxx-xxxxx-xxxxx-xxxx-xxxxxxxxx -derivedDataPath build/myproject")*

In this case, there should be a scheme named myproject in your ios configurations. The way I fixed it is,

Double clicked on myproject.xcworkspace in ios directory (to open workspace with Xcode)

Navigate into Product > Scheme > Manage Schemes...

Created a Scheme appropriately with name myproject (this name is case-sensitive)

Ran react-native run-ios in project directory

After upgrading react-native, you may have stale dependencies. The steps below should fix it.

1. cd ios
2. delete Podfile.lock
3. pod deintegrate && pod install
4. Navigate back to package.json directory
5. run react-native run-ios
6. In Xcode you can build your project again too

Hope this helps, I did this after upgrading to react-native 0.61

I had the same error, but it was caused by the package manager process port being already used (port 8081).

To fix, I just ran the react-native by specifying a different port, see below.

react-native run-ios --port 8090

If you don't have cocoa pods installed you need to sudo gem install cocoapods

1. run cd ios
2. run pod install
3. cd ..
4. delete build folder
5. run react-native run-ios

if error persists, 1. delete build folder again 2. open the /ios folder in x-code 3. navigate File -> Project Settings -> Build System -> change (Shared workspace settings and Per-User workspace settings): Build System -> Legacy Build System

run pod install inside ios folder then go back to root folder and run npx react-native run-ios

If you don't have cocoa pods installed you need to:

sudo gem install cocoapods

Then run:

cd /ios
pod install

delete the build folder in ios folder of your react native project

run:

react-native run-ios

if error persists:

• delete build folder again
• open the /ios folder in Xcode
• navigate File -> Project Settings -> Build System -> change (Shared workspace settings and Per-User workspace settings): Build System -> Legacy Build System

Here is the a possible solution

The problem is found in RealmReact.xcodeproj