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After the Xamarin.iOS app builds and the simulator (iPhone 6s iOS 11.2) is going to launch Visual Studio 2017 becomes unresponsive.
The problem started after the Xcode update to version 9.2.
Visual Studio for Mac 18.104.22.1687
Xamarin Agent 22.214.171.1242
Windows 10 version 1709 build 16299.64
Visual Studio 2017 version 15.5
Visual Studio 2017 version 15.5 did not support Xcode 9.2 and there were issues related to the simulator due to this, but we have released an update to support it now. Are you still experiencing this issue with the latest version, 15.5.2?
Yes, I'm still experiencing this issue with Visual Studio 2017 15.5.2 and Visual Studio for Mac 126.96.36.199.
When I launch the simulator it ends with fatal error. The second try launches it but the screen is black. Then I must close the simulator and launch it for the third time. Then it works.
I tried to reset its content and settings, but without any effect.
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Threading.SemaphoreFullException
at Xamarin.Messaging.Client.MessagingConnection.OnClientDisconnected(System.Object, System.Net.Mqtt.MqttEndpointDisconnected)
at System.EventHandler`1[[System.__Canon, mscorlib, Version=188.8.131.52, Culture=neutral, PublicKeyToken=b77a5c561934e089]].Invoke(System.Object, System.__Canon)
at System.Net.Mqtt.Sdk.MqttClientImpl.Close(System.Net.Mqtt.DisconnectedReason, System.String)
at System.Reactive.AnonymousSafeObserver`1[[System.__Canon, mscorlib, Version=184.108.40.206, Culture=neutral, PublicKeyToken=b77a5c561934e089]].OnCompleted()
at System.Reactive.ScheduledObserver`1[[System.__Canon, mscorlib, Version=220.127.116.11, Culture=neutral, PublicKeyToken=b77a5c561934e089]].Dispatch(System.Reactive.Disposables.ICancelable)
at System.Reactive.Concurrency.Scheduler+<>c.<ScheduleLongRunning>b__72_0(System.Action`1<System.Reactive.Disposables.ICancelable>, System.Reactive.Disposables.ICancelable)
at System.Reactive.Concurrency.NewThreadScheduler+<>c__DisplayClass7_0`1[[System.__Canon, mscorlib, Version=18.104.22.168, Culture=neutral, PublicKeyToken=b77a5c561934e089]].<ScheduleLongRunning>b__0()
at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
Stack trace added.
Had the same issue, solved by full rebuild - first manually cleaning bin/obj folders in all projects, then rebuild in VS
It helps but the error is back after a few debug/stop cycles. It is very annoying.