Failed to find or create execution context for description <IBCocoaTouchPlatformToolDescription: 0x7fa8bad9a6f0>

I'm working on a project for iOS and I'm doing the programming with Visual Studios and it connects to a mac server using Xamarin. I recently tried to add more views to the storyboard and an additional class. When I tried to build the code, I received this error. http://pastebin.com/Ub5s89aa This is what the output from the console. http://pastebin.com/fhWDy2cJ

I don't know what this error means and when I tried to look up any part of the error, nothing helped. I cleaned my builded and tried to rebuild, and I also closed Visual Studios and reopen it to see if that help, but it didn't. Has anyone else had this problem before?

Restarting the CoreSimulatorService solved the issue on my machine.

sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService

I had the same problem after I upgrade my Xcode to version 10.3.

> I just restart my Mac and problem solved!

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Hope this would work with you too :)

Mine happened when updating to Xcode 10.3

X-code helper didn't get the permission to control the computer.

This is what i did to solve the problem

System Preference > Security&Privacy > privacy tab > accessibility

give permission for 'Xcode Helper'

Restart X-code and kill all simulators like @riik stated

sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService

This issue is with xcode update 10.3 and mixpannel is gives this as build error

Steps to fix.

Open terminal and paste this

sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService

Clean Xcode and build. Thats all

After having a google I found a similar question here and here, summary of the some of the answers in that question:

• Make sure you are running the latest version of Xcode and you dont have a beta installed.
• Close Xcode and then opened up Activity Monitor. Terminate any Ibtool processes running and restart Xcode.
• Delete any custom color pickers you have installed in for Xcode, close the Xcode and relaunch
• Try recreating any nibs you may have changed.

summary from the Xamarin Forums link:

> Uninstall Xamarin studio, Xcode
> Delete /Libraries/Developer and > ~/Libraries/Developer folders
> Reboot
> Reinstall Xcode, Xamarin studio

If none of these work could you check in the Console.app for any errors when building.

Hope this helps.

I had my Xcode files on an external drive in User/Library/Developer/CoreSimulator. The issue was fixed upon doing the command sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService then moving these developer files back onto the mac.

I got this error after installing Xcode 12 beta. Restarting my Mac did not fix the problem. I had to reinstall Command Line Tools:

• delete /Library/Developer (note this is the root Library directory, not ~/Library);
• launch Xcode and let it install Command Line Tools.

I fixed same issue by restart mac and rebuild project. CMD + B!

None of these other solutions worked for me, unfortunately. After hours of digging, I discovered I had to reset the read/write permissions in my home folder.

For me the issue was caused by the build getting executed by a launch daemon (on a CI server) without a user being logged in. Switching to a launch agent that is run when the user is logged in fixed the issue.

We recently had this issue after upgrading to Xcode 12 on our CI machine. Turn out we did not launched Xcode prior to using xcodebuild commands.

• Launch Xcode and let it install Command Line Tools solved this.

Hope this help somebody

I solved this error and other weird build errors to which the standard recommendations of this site did not solve, by moving my project from external SSD to internal disk. My advice never put your projects on external disks while you are working on them at least.