Xamarin.iOS 不能 create/open 故事板
Xamarin.iOS cannot create/open storyboard
我们在 Xamarin.iOS 中创建 故事板时遇到问题。我们已与 Mac 配对，并且在 VS GUI 上显示它已连接。
当我们尝试创建（或在新项目中打开现有故事板）时，我们得到相同的错误：
System.AggregateException: One or more errors occurred. ---> System.AggregateException: One or more errors occurred. ---> MonoTouch.Design.Client.InvalidSessionException: Error in the application.
at MonoTouch.Design.Client.ServerProcessConnection.SendRequest(CommandRequest req, Boolean throwIfNotRunning) in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 235
at MonoTouch.Design.Client.ServerProcessConnection.SendRequest[TResponse](CommandRequest req, Boolean throwIfNotRunning) in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 252
at MonoTouch.Design.Client.ServerProcessConnection.CreateSession() in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 111
at MonoTouch.Design.Client.ServerProcessConnection.<CreateSessionAsync>b__28_0() in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 116
at System.Threading.Tasks.Task`1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at System.Threading.Tasks.Task`1.get_Result()
at MonoTouch.Design.Client.IPhoneDesignerSession.<>c__DisplayClass289_1`1.<EnsureSession>b__1(Task`1 t) in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\IPhoneDesignerSession.cs:line 2070
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
at System.Threading.Tasks.Task.Wait()
at MonoTouch.Design.Client.IPhoneDesignerSession.<>c__DisplayClass289_0`1.<EnsureSession>b__0() in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\IPhoneDesignerSession.cs:line 2136
at System.Threading.Tasks.Task`1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of stack trace from previous location where exception was thrown ---
[Truncated here]
Windows10和Catalina上的VS版本都是最新的（不能更新了）Xcode是11.3版本
我在网上看了很多文章说更新重启IDE应该没问题，但是我什么也做不了...
有人知道如何解决这个问题吗？
问题似乎是在 macOS 版本中。
我和一些使用不同类型软件 (Flash Builder) 的同事谈过，他说他在 Catalina macOS 上遇到了类似的问题。
所以我切换回 Mojave，已更新至 10.4.16。并安装了 Xcode 和 VSforMac，它终于可以工作了（或适用于 iPhone 8 iOS 13）
我们在 Xamarin.iOS 中创建 故事板时遇到问题。我们已与 Mac 配对，并且在 VS GUI 上显示它已连接。 当我们尝试创建（或在新项目中打开现有故事板）时，我们得到相同的错误：
System.AggregateException: One or more errors occurred. ---> System.AggregateException: One or more errors occurred. ---> MonoTouch.Design.Client.InvalidSessionException: Error in the application.
at MonoTouch.Design.Client.ServerProcessConnection.SendRequest(CommandRequest req, Boolean throwIfNotRunning) in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 235
at MonoTouch.Design.Client.ServerProcessConnection.SendRequest[TResponse](CommandRequest req, Boolean throwIfNotRunning) in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 252
at MonoTouch.Design.Client.ServerProcessConnection.CreateSession() in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 111
at MonoTouch.Design.Client.ServerProcessConnection.<CreateSessionAsync>b__28_0() in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 116
at System.Threading.Tasks.Task`1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at System.Threading.Tasks.Task`1.get_Result()
at MonoTouch.Design.Client.IPhoneDesignerSession.<>c__DisplayClass289_1`1.<EnsureSession>b__1(Task`1 t) in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\IPhoneDesignerSession.cs:line 2070
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
at System.Threading.Tasks.Task.Wait()
at MonoTouch.Design.Client.IPhoneDesignerSession.<>c__DisplayClass289_0`1.<EnsureSession>b__0() in E:\A\_work\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\IPhoneDesignerSession.cs:line 2136
at System.Threading.Tasks.Task`1.InnerInvoke()
at System.Threading.Tasks.Task.Execute()
--- End of stack trace from previous location where exception was thrown ---
[Truncated here]
Windows10和Catalina上的VS版本都是最新的（不能更新了）Xcode是11.3版本
我在网上看了很多文章说更新重启IDE应该没问题，但是我什么也做不了...
有人知道如何解决这个问题吗？
问题似乎是在 macOS 版本中。
我和一些使用不同类型软件 (Flash Builder) 的同事谈过，他说他在 Catalina macOS 上遇到了类似的问题。
所以我切换回 Mojave，已更新至 10.4.16。并安装了 Xcode 和 VSforMac，它终于可以工作了（或适用于 iPhone 8 iOS 13）