Compile error Studio 2020.6

Hello,

I’m having an issue when compiling a library with UiPath Studio 2020.6

System.AggregateException: One or more errors occurred. —> UiPath.ActivityCompiler.Exceptions.UiPathLocalizedException: Unable to create activity builder for document. Reason was 'Cannot create unknown type ‘{http://schemas.microsoft.com/netfx/2009/xaml/activities}Catch({http://schemas.microsoft.com/netfx/2009/xaml/servicemodel}CommunicationException)’

when I compile with mi old Studio 2019.6, it compiles perfectly.

Maybe a dependence is lost with the new installation or similar. The Studio doesn’t shows any error until compilation. Thank you in advance.

full error:
Se ha producido un error inesperado durante el proceso de compilación de la biblioteca:
System.AggregateException: One or more errors occurred. —> UiPath.ActivityCompiler.Exceptions.UiPathLocalizedException: Unable to create activity builder for document. Reason was ‘Cannot create unknown type ‘{http//schemas.microsoft.com/netfx/2009/xaml/activities}Catch({http//schemas.microsoft.com/netfx/2009/xaml/servicemodel}CommunicationException)’.’. —> System.Xaml.XamlObjectWriterException: Cannot create unknown type ‘{http//schemas.microsoft.com/netfx/2009/xaml/activities}Catch({http//schemas.microsoft.com/netfx/2009/xaml/servicemodel}CommunicationException)’.
en System.Xaml.XamlObjectWriter.WriteStartObject(XamlType xamlType)
en System.Xaml.XamlWriter.WriteNode(XamlReader reader)
en System.Xaml.XamlServices.Transform(XamlReader xamlReader, XamlWriter xamlWriter, Boolean closeWriter)
en System.Xaml.XamlServices.Load(XamlReader xamlReader)
en UiPath.ActivityCompiler.CompilerV2.ActivityBuilderLoader.LoadFromString(String content)
— Fin del seguimiento de la pila de la excepción interna —
en UiPath.ActivityCompiler.CompilerV2.ActivityBuilderLoader.LoadFromString(String content)
en UiPath.ActivityCompiler.CommandLine.ProgramExtensions.<>c__DisplayClass2_2.b__6()
en System.Lazy1.CreateValue() en System.Lazy1.LazyInitValue()
en System.Lazy1.get_Value() en UiPath.ActivityCompiler.CompilerV2.LibraryFactory.<>c__DisplayClass8_0.<Build>b__1(Int32 _) en System.Threading.Tasks.Parallel.<>c__DisplayClass17_01.b__1()
en System.Threading.Tasks.Task.InnerInvoke()
en System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
en System.Threading.Tasks.Task.<>c__DisplayClass176_0.b__0(Object )
— Fin del seguimiento de la pila de la excepción interna —
en System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
en System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
en System.Threading.Tasks.Task.Wait()
en System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action1 body, Action2 bodyWithState, Func4 bodyWithLocal, Func1 localInit, Action1 localFinally) en System.Threading.Tasks.Parallel.For(Int32 fromInclusive, Int32 toExclusive, Action1 body)
en UiPath.ActivityCompiler.CompilerV2.LibraryFactory.Build(LoggingScope scope, GenerateLibraryRequest generateLibraryRequest)
en UiPath.ActivityCompiler.CommandLine.ProgramExtensions.<>c__DisplayClass3_0.b__0(LoggingScope documentsScope)
en UiPath.ActivityCompiler.Logging.LoggingScope.Execute(Action1 action) en UiPath.ActivityCompiler.Logging.LoggingManager.ExecuteCompilerV2DocumentsCompiler(LoggingScope parent, Action1 action)
en UiPath.ActivityCompiler.CommandLine.ProgramExtensions.ExecuteCompilerV2DocumentsCompiler(LoggingScope csharpCompilerScope, GenerateLibraryRequest libraryRequest, LibraryFactory libraryFactory)
en UiPath.ActivityCompiler.CommandLine.ProgramExtensions.<>c__DisplayClass2_0.b__0(LoggingScope csharpCompilerScope)
en UiPath.ActivityCompiler.Logging.LoggingScope.Execute(Action1 action) en UiPath.ActivityCompiler.Logging.LoggingManager.ExecuteCompilerV2(LoggingScope parent, Action1 action)
en UiPath.ActivityCompiler.CommandLine.ProgramExtensions.ExecuteCompilerV2(LoggingScope scope, CompilerOptions programArgs, List1 documents) en UiPath.ActivityCompiler.CommandLine.Program.<>c__DisplayClass4_1.<RunCompiler>b__0(LoggingScope compilerScope) en UiPath.ActivityCompiler.Logging.LoggingScope.Execute(Action1 action)
en UiPath.ActivityCompiler.Logging.LoggingManager.ExecuteRunCompiler(LoggingScope parent, Action1 action) en UiPath.ActivityCompiler.CommandLine.Program.RunCompiler(LoggingScope mainScope, CompilerOptions programArgs) en UiPath.ActivityCompiler.CommandLine.Program.RunCompilerWithFile(LoggingScope parentScope, StudioOptions opts) en UiPath.ActivityCompiler.CommandLine.Program.<>c__DisplayClass2_1.<Main>b__2(StudioOptions opts) en CommandLine.ParserResultExtensions.MapResult[T1,T2,TResult](ParserResult1 result, Func2 parsedFunc1, Func2 parsedFunc2, Func2 notParsedFunc) en UiPath.ActivityCompiler.CommandLine.Program.<>c__DisplayClass2_0.<Main>b__0(LoggingScope scope) ---> (Nº de excepción interna 0) UiPath.ActivityCompiler.Exceptions.UiPathLocalizedException: Unable to create activity builder for document. Reason was 'Cannot create unknown type '{http//schemas.microsoft.com/netfx/2009/xaml/activities}Catch({http//schemas.microsoft.com/netfx/2009/xaml/servicemodel}CommunicationException)'.'. ---> System.Xaml.XamlObjectWriterException: Cannot create unknown type '{http//schemas.microsoft.com/netfx/2009/xaml/activities}Catch({http//schemas.microsoft.com/netfx/2009/xaml/servicemodel}CommunicationException)'. en System.Xaml.XamlObjectWriter.WriteStartObject(XamlType xamlType) en System.Xaml.XamlWriter.WriteNode(XamlReader reader) en System.Xaml.XamlServices.Transform(XamlReader xamlReader, XamlWriter xamlWriter, Boolean closeWriter) en System.Xaml.XamlServices.Load(XamlReader xamlReader) en UiPath.ActivityCompiler.CompilerV2.ActivityBuilderLoader.LoadFromString(String content) --- Fin del seguimiento de la pila de la excepción interna --- en UiPath.ActivityCompiler.CompilerV2.ActivityBuilderLoader.LoadFromString(String content) en UiPath.ActivityCompiler.CommandLine.ProgramExtensions.<>c__DisplayClass2_2.<ExecuteCompilerV2>b__6() en System.Lazy1.CreateValue()
en System.Lazy1.LazyInitValue() en System.Lazy1.get_Value()
en UiPath.ActivityCompiler.CompilerV2.LibraryFactory.<>c__DisplayClass8_0.b__1(Int32 _)
en System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.b__1()
en System.Threading.Tasks.Task.InnerInvoke()
en System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
en System.Threading.Tasks.Task.<>c__DisplayClass176_0.b__0(Object )<—

—> (Nº de excepción interna 1) UiPath.ActivityCompiler.Exceptions.UiPathLocalizedException: Unable to create activity builder for document. Reason was ‘Cannot create unknown type ‘{http//schemas.microsoft.com/netfx/2009/xaml/activities}Catch({http//schemas.microsoft.com/netfx/2009/xaml/servicemodel}CommunicationException)’.’. —> System.Xaml.XamlObjectWriterException: Cannot create unknown type ‘{http//schemas.microsoft.com/netfx/2009/xaml/activities}Catch({http//schemas.microsoft.com/netfx/2009/xaml/servicemodel}CommunicationException)’.
en System.Xaml.XamlObjectWriter.WriteStartObject(XamlType xamlType)
en System.Xaml.XamlWriter.WriteNode(XamlReader reader)
en System.Xaml.XamlServices.Transform(XamlReader xamlReader, XamlWriter xamlWriter, Boolean closeWriter)
en System.Xaml.XamlServices.Load(XamlReader xamlReader)
en UiPath.ActivityCompiler.CompilerV2.ActivityBuilderLoader.LoadFromString(String content)
— Fin del seguimiento de la pila de la excepción interna —
en UiPath.ActivityCompiler.CompilerV2.ActivityBuilderLoader.LoadFromString(String content)
en UiPath.ActivityCompiler.CommandLine.ProgramExtensions.<>c__DisplayClass2_2.b__6()
en System.Lazy1.CreateValue() en System.Lazy1.LazyInitValue()
en System.Lazy1.get_Value() en UiPath.ActivityCompiler.CompilerV2.LibraryFactory.<>c__DisplayClass8_0.<Build>b__1(Int32 _) en System.Threading.Tasks.Parallel.<>c__DisplayClass17_01.b__1()
en System.Threading.Tasks.Task.InnerInvoke()
en System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
en System.Threading.Tasks.Task.<>c__DisplayClass176_0.b__0(Object )<—