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Preview doesn't work for SfButton on Visual Studio Mac

When I have SfButton in my XAML the previewer stop working with the following error, this happening on Visual Studio Mac.

MonoTouch.Design.Client.InvalidSessionException: Error in the application.
  at MonoTouch.Design.Client.ServerProcessConnection.SendRequest (MonoTouch.Design.CommandRequest req, System.Boolean throwIfNotRunning) [0x000ac] in /Users/vsts/agent/2.142.1/work/1/s/Xamarin.Designer.iOS/MonoTouch.Design.Client/Connection/ServerProcessConnection.cs:239 
  at MonoTouch.Design.Client.ServerProcessConnection.SendRequest[TResponse] (MonoTouch.Design.CommandRequest req, System.Boolean throwIfNotRunning) [0x00001] in /Users/vsts/agent/2.142.1/work/1/s/Xamarin.Designer.iOS/MonoTouch.Design.Client/Connection/ServerProcessConnection.cs:243 
  at MonoTouch.Design.Client.ServerProcessConnection.RenderXamls (MonoTouch.Design.DesignSession session, MonoTouch.Design.XamlRenderContext context) [0x0000e] in /Users/vsts/agent/2.142.1/work/1/s/Xamarin.Designer.iOS/MonoTouch.Design.Client/Connection/ServerProcessConnection.cs:177 
  at Xamarin.Designer.Forms.Preview.iOSXamlRenderer+<>c__DisplayClass3_0.<RenderXamls>b__0 (MonoTouch.Design.Client.ServerProcessConnection c) [0x00000] in /Users/vsts/agent/2.142.1/work/1/s/Xamarin.Designer.Forms/Xamarin.Designer.Forms.Preview/iOS/iOSXamlRenderer.cs:56 
  at MonoTouch.Design.Client.IPhoneDesignerSession+<>c__DisplayClass268_0`1[TResult].<EnsureSession>b__0 () [0x002bb] in /Users/vsts/agent/2.142.1/work/1/s/Xamarin.Designer.iOS/MonoTouch.Design.Client/IPhoneDesignerSession.cs:2023 
  at System.Threading.Tasks.Task`1[TResult].InnerInvoke () [0x0000f] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-06/external/bockbuild/builds/mono-x64/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:545 
  at System.Threading.Tasks.Task.Execute () [0x00000] in /Users/builder/jenkins/workspace/build-package-osx-mono/2018-06/external/bockbuild/builds/mono-x64/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2344 
--- End of stack trace from previous location where exception was thrown ---

  at Xamarin.Designer.Forms.Preview.iOSXamlRenderer.RenderXamls (MonoTouch.Design.XamlRenderContext context, System.Threading.CancellationToken token) [0x00210] in /Users/vsts/agent/2.142.1/work/1/s/Xamarin.Designer.Forms/Xamarin.Designer.Forms.Preview/iOS/iOSXamlRenderer.cs:56 

7 Replies
MS Mugundhan Saravanan Syncfusion Team February 7, 2019 03:50 PM UTC

Hi Almis,  
Greeting from Syncfusion. 
We have prepared the simple SfButton sample and we have deployed the sample in Visual Studio Mac. On checking the xaml design with previewer we were unable to reproduce the exception. We have provided the sample with the screenshot of the previewer in iOS. Please check the screenshot as reference from the below link. 
Screenshot: 
 
Please try our sample and check whether you could reproduce the reported issue in previewer. If not please let us know in which scenario you could reproduce the issue. It will help us to provide exact solution for your requirement. 
Regards,
Mugundhan S. 


RO Roy April 29, 2020 12:01 AM UTC

I'm also having the same issue on Visual Studio Enterprise 2019 running on Windows 10 (see my configuration at the end of this message).
I was getting the MonoTouch error whenever a SyncFusion control was added to the solution. Then I read somewhere to reinstall XCode on the Mac to install the latest version of MonoTouch. After doing that, I was prompted on Visual Studio (Windows 10) to reinstall MonoTouch because there was a discrepancy on the MonoTouch version on the Mac. I clicked YES to reinstall MonoTouch, I believe Visual Studio forced an updated on the Mac. 
After that, I started getting 
An exception occurred while rendering the control. 
System.IO.FileNotFoundException was thrown.
Could not load the file 'Xamarin.Forms.Platform.iOS'

Has anybody found a solution for this problem? The preview works fine if I use the original Xamarin controls.

Microsoft Visual Studio Enterprise 2019
Version 16.5.4
VisualStudio.16.Release/16.5.4+30011.22
Microsoft .NET Framework
Version 4.8.03752

ADL Tools Service Provider   1.0
This package contains services used by Data Lake tools
ASP.NET and Web Tools 2019   16.5.236.49856
ASP.NET and Web Tools 2019
ASP.NET Web Frameworks and Tools 2019   16.5.236.49856
For additional information, visit https://www.asp.net/
Azure App Service Tools v3.0.0   16.5.236.49856
Azure Data Lake Node   1.0
Azure Data Lake Tools for Visual Studio   2.4.5000.0
Microsoft Azure Data Lake Tools for Visual Studio
Azure Functions and Web Jobs Tools   16.5.236.49856
Azure Stream Analytics Tools for Visual Studio   2.4.5000.0
C# Tools   3.5.0-beta4-20153-05+20b9af913f1b8ce0a62f72bea9e75e4aa3cf6b0e
Common Azure Tools   1.10
Extensibility Message Bus   1.2.0 (d16-2@8b56e20)
Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration.
Fabric.DiagnosticEvents   1.0
IntelliCode Extension   1.0
Microsoft Azure HDInsight Azure Node   2.4.5000.0
Microsoft Azure Hive Query Language Service   2.4.5000.0
Microsoft Azure Service Fabric Tools for Visual Studio   16.0
Microsoft Azure Stream Analytics Language Service   2.4.5000.0
Microsoft Azure Stream Analytics Node   1.0
Microsoft Azure Tools for Microsoft Visual Studio 2019 - v2.9.30207.1
Microsoft Continuous Delivery Tools for Visual Studio   0.4
Microsoft JVM Debugger   1.0
Microsoft Library Manager   2.1.25+gdacdb9b7a1
Microsoft MI-Based Debugger   1.0
Microsoft Visual C++ Wizards   1.0
Microsoft Visual Studio Tools for Containers   1.1
Microsoft Visual Studio VC Package   1.0
Mono Debugging for Visual Studio   16.5.514 (c4f36a9)
NuGet Package Manager   5.5.0
Office Developer Tools for Visual Studio   16.0.29724.00
ProjectServicesPackage Extension   1.0
Snapshot Debugging Extension   1.0
SQL Server Data Tools   16.0.62003.05170
Syncfusion UWP Project Templates   18.1.0.42
Syncfusion Xamarin Project Templates   13.4.0.53
Syncfusion Xamarin Toolbox   16.2.0.19
Syncfusion.VSExtension.Troubleshooter   18.1.0.42
SyncfusionMenu Extension   1.0
SyncfusionXamarinMenu Extension   1.0
ToolWindowHostedEditor   1.0
TypeScript Tools   16.0.20225.2001
Visual Basic Tools   3.5.0-beta4-20153-05+20b9af913f1b8ce0a62f72bea9e75e4aa3cf6b0e
Visual F# Tools 10.8.0.0 for F# 4.7   16.5.0-beta.20181.6+85af456066acd4e76d2bc7821b44a325e46f2fca
Visual Studio Code Debug Adapter Host Package   1.0
Visual Studio Container Tools Extensions (Preview)   1.0
Visual Studio Tools for Containers   1.0
Visual Studio Tools for Kubernetes   1.0
VisualStudio.DeviceLog   1.0
VisualStudio.Foo   1.0
VisualStudio.Mac   1.0
Workflow Manager Tools 1.0   1.0
Xamarin   16.5.000.533 (d16-5@9152e1b)
Xamarin Designer   16.5.0.470 (remotes/origin/d16-5@681de3fd6)
Xamarin Templates   16.5.49 (0904f41)
Xamarin.Android SDK   10.2.0.100 (d16-5/988c811)
     Mono: c0c5c78
    Java.Interop: xamarin/java.interop/d16-5@fc18c54
    ProGuard: xamarin/proguard/master@905836d
    SQLite: xamarin/sqlite/3.28.0@46204c4
    Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-5@9f4ed4b
Xamarin.iOS and Xamarin.Mac SDK   13.16.0.13 (b75deaf)


RO Roy April 29, 2020 12:25 AM UTC

I just noticed that there's a new SyncFusion update available (on 28-Apr-2020). 
After updating SyncFusion controls, I was able to render in the iOS simulator. 

To update SyncFunsion:
  1. In Visual Studio, choose from the menu Tools > NuGet Package Manager > Manage NuGet Packages for Solution...
  2. At the top, click on the Updates tab
  3. Select all packages, then click Update. 



RO Roy April 29, 2020 12:27 AM UTC

I celebrated too early. It worked for a few minutes, until other NuGet Packages appeared on the update list. After updating those packages, the iOS preview was broken again. 

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\283\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\283\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 252
   at MonoTouch.Design.Client.ServerProcessConnection.CreateSession() in E:\A\_work\283\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\283\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\283\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\IPhoneDesignerSession.cs:line 2072
   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\283\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\IPhoneDesignerSession.cs:line 2146
   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 System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at Xamarin.Designer.Forms.Preview.iOSXamlRenderer.<RenderXamls>d__3.MoveNext() in E:\A\_work\283\s\Xamarin.Designer.Forms\Xamarin.Designer.Forms.Preview\iOS\iOSXamlRenderer.cs:line 72
---> (Inner Exception #0) 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\283\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\283\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 252
   at MonoTouch.Design.Client.ServerProcessConnection.CreateSession() in E:\A\_work\283\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\283\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\283\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\IPhoneDesignerSession.cs:line 2072
   at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
---> (Inner Exception #0) MonoTouch.Design.Client.InvalidSessionException: Error in the application.
   at MonoTouch.Design.Client.ServerProcessConnection.SendRequest(CommandRequest req, Boolean throwIfNotRunning) in E:\A\_work\283\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\283\s\Xamarin.Designer.iOS\MonoTouch.Design.Client\Connection\ServerProcessConnection.cs:line 252
   at MonoTouch.Design.Client.ServerProcessConnection.CreateSession() in E:\A\_work\283\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\283\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)<---
<---


AS Anandraj Selvam Syncfusion Team April 29, 2020 11:03 AM UTC

Hi Roy, 
  
We have checked that reported issue again with our end and it seems like a framework level issue, could you please ensure or follow up this with below mentioned Xamarin support 
  
  
Please let us know if you need any further assistance. 
  
Regards, 
Anand Raj S. 


RO Roy April 29, 2020 09:45 PM UTC

I found a workaround. You need to use Xamarin.Forms Version 4.5.0.356 in your projects.

I posted the steps in the Xamarin.Forms Forum:


SJ Suyamburaja Jayakumar Syncfusion Team April 30, 2020 07:26 AM UTC

Hi Roy,  
  
Thanks for your suggestion. we are glad to hear that your requirement has been achieved.  
  
Please let us know if you need any further assistance on this.  
  
Regards,  
Suyamburaja J.  


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