My phone was set to "trust" the Mac, and I still ran into this error with Xcode 6.1.1.
This worked for me:
I recently ran into this issue with XCode 8 just after updating my device from iOS 9 to 10. The exact error I received was:Development cannot be enabled while your device is locked. Please unlock your device and reattach.
I received this error even when my phone was unlocked, and after unplugging and re-plugging in the device.
As is mentioned in several answers, the device is locked
message is actually referring to the device not trusting the MacBook. In my case, I think my phone defaulted to not trusting my computer after updating to iOS 10. Here are the steps that worked for me to reset the settings (this is the same process that is mentioned in the Apple support page in tehprofessors' answer):
Settings > General > Reset
, then tap Reset Location & Privacy
device locked
error should disappear.A simple solution:
First, unplug your device.
Now, unlock your device and plug it in again. Be sure that the device is unlocked.
Now run the Xcode project by selecting the device as target.
Recently I have met the Xcode shows "development cannot be enabled while your device is locked, Please unlock your device and reattach. (0xE80000E2).
If your iOS device is already unlocked and connected to mac and still get the error from Xcode 8.1 after upgrading to iOS 10.1.1, then the mac is not trusted by the device.
To fix it, first disconnect device to mac and then go to iOS settings app, and open general->reset->Reset Location & Privacy.
Then connect device to mac and when prompted, set select trust the mac.
Then wait the processing symbol files within your device and mac. After it finished, you can run the project to your device. It will be working.
On your device (iPhone/iPad) goto: Settings -> Developer -> Clear Trusted Computers worked for me.
Check the "Low Power Mode" in disabled. In my case I just disable this check and the deploy works immediately,
sometimes your device stops trusting your PC for no reseaon. go to your settings then general > reset > reset location and privacy. and replug your device to your PC again and press "trust this device" prompt that shows up in your phone.
These steps worked for me in iOS 10.
I tried every answer on this page (7 at the time, though 2 are duplicates) and they were all unsuccessful for getting rid of this Xcode error for me.
For me, when I was about to unpair my device from xcode, I noticed it was just Preparing debugger support for my iPhone and it told me that "Xcode will continue when iPhone is finished." Similar to this issue
Generally just unplugging/replugging seems to work for me. But today it didn't and something else seems to have worked: I have enabled network debugging on the device in question and it almost looked like it remembered an old network "lock" setting, while not seeing that the device was actually connected via USB. After (temporarily) de-selecting "Connect via Network" and replugging, it got things working again.
This issue is not about "Trust" or not. It's a bug in Xcode.
Just follow these steps.
When Xcode is running and your device is connected:
For those who has this issue in Xcode 9: Simply restarting Xcode should solve the problem.
From the Window Menu in top bar of Xcode, select Devices and Simulators.
(or Press SHIFT + COMMAND + 2)
Then select your device, right click and select Unpair.
Once you do this Trust or Don't trust will appear on your device.
Trust the device again and it will begin preparing it for Development.
Wait for Xcode to pair device for development and then you are good to go!
When you plug in your iPhone, it will ask you to trust the computer. If you already trust and unlocked but still said your device was locked (bug). Just unplug and plug again then it will work
One possibility worth checking, if none of these other solutions work, is that there is no space left on the device. Xcode will not give you a helpful "device full" error to tell you that your device has no storage space left, but it will also not be able to deploy an app build to a device whose storage is full. The only solution in that situation is to delete media or other apps/data to free up enough space.
My problem was I was trying to install on an unsupported (new) iOS version which produced the same errors. Specifically Xcode 11.7 to iOS 14
Another fix to this problem is to connect your iPhone with your Xcode open while your iPhone is in the homescreen, not in lockscreen or with an app opened.
I found that by shutting down a Console and a running Simulator allowed XCode to see my iPhone again. I'd make sure other related programs aren't running if you don't need them.
Bizare, but I hope it helps someone. I was connected to a VPN (Pro XPN) and that was causing the issue! Disconnected and it worked.
I ran in to the same issue even though i selected "Trust this computer" option first time.
This worked for me
For anyone who need a logical answer..
there are two solution worked for me. 1) disconnect your device from the mac and reattach it. 2) disconnect your device from the mac and restart it and then connect it with mac it'll work
I run into this problem quite often (at least like 5 times a week). Almost every time this happens, a Xcode restart fixes it. But this time nothing seemed to work including:
Done dozens of times in all sorts of different orders.
What fixed the issue for me this time was simply:
? Rebooting the Mac.
I had to re-add device to xcode.
In XCode open Devices and Simulators (CMD+Shift+2), in left list press + button and re-add the same device.
All the previous solutions didn't work.
Finlay, changing the iPhone's cable solved the problem.
There is a simple way to resolve that. At least it works for me. In your iPhone Device Go to Setting > Developer > click in “Clear Trusted Computer” Type the passcode required And done!!!
The simplest way that I found.
Lots of answers, but the one that worked for me (El Capitan, Xcode 8.2) was to close iTunes. If that has a connection to the IOS device then although Xcode can load the app components it will still fail to run it.
I haven't seen this in any of the answers here, but the only thing that worked for me is an option on the device itself called Enable UI Automation. Supposedly it will turn itself off after an update. Go to Settings, Developer, then find Enable UI Automation.
This worked on my iPad 6th generation.
This can also happen due to pending update on your device. This also means you need to update your phone, connect to the MacBook (trust it if needed). This how I found my problem and solution.
This happens at times while using Xcode 9.
There are multiple solution to this as mentioned below :
Note : Make sure that your device is not locked when Xcode is trying to install app.
Solution 1 :
i. Disconnect device
and connect again
Solution 2 :
i. Restart you device
Solution 3 :
i. Disconnect device
ii. Quit Xcode
(Shortcut key : cmd + Q)
iii. Open your project
iv. Clean project
(Shortcut key : cmd + shift + K
)
v. Now connect device
vi. Run
your project
For me Solution 3 worked perfectly
Source: Stackoverflow.com