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This error occurred three times in an automation run where we build all of iOS templates. This appears to be a transient failure, but nonetheless is an issue.
>C:\Program Files (x86)\MSBuild\Xamarin\iOS\Xamarin.iOS.Windows.After.targets(63,5): error : Collection was modified; enumeration operation may not execute.
> Output Property: MtouchTargetsEnabled=False (TaskId:8)
> Output Property: IsMacEnabled=False (TaskId:8)
>Done executing task "SayHello" -- FAILED. (TaskId:8)
>Done building target "_SayHello" in project "SpriteKitGameiPhoneApp.csproj" -- FAILED.: (TargetId:8)
SpriteKit Game (iPhone)
OpenGL Game (iPad)
SpriteKit Game (iPad)
1: Select menu File > New > Project...
2: Select category Templates > Visual C# > iOS > iPhone
3: Select template SpriteKit Game (iPhone)
4: Set project name to SpriteKitGameiPhoneApp
5: Set solution name to SpriteKitGameiPhoneAppSln
6: Set location to C:\TestResults\48809a62\SpriteKitGameiPhoneApp\Temp
7: Click button 'OK'
8: Wait for connection with status: Successfully connected to the Mac!
9: Select menu Build > Build Solution
XVS: 18.104.22.1681 (cycle9/48809a6)