Exception When invoking Saved Xaml Workflow by Kevin Van Looy

Following piece of code throws the exception where element.workpath is the path to the xaml file
the code is part of a running service , that needs to execute workflows.


Activity activity = ActivityXamlServices.Load(element.WorkflowPath);
WorkflowInvoker.Invoke(activity, new Dictionary<string, object> { { "InEvent", e } });

When loading the attached xaml activity an exception occurs
It seems to fail on a part of the xaml : <mva:VisualBasic.Settings>Assembly references and imported namespaces serialized as XML namespaces</mva:VisualBasic.Settings>

When I remove this line it continues to load and even executes the flow but I can not access the arguments provided.

Failed to create a 'Settings' from the text 'Assembly references and imported namespaces serialized as XML namespaces'.</log4j:message><log4j:properties><log4j:data name="log4net:UserName" value="XPSP2TEST\Colos" /><log4j:data name="log4jmachinename" value="xpsp2test" /><log4j:data name="log4japp" value="DebugStart.exe" /><log4j:data name="log4net:HostName" value="xpsp2test" /></log4j:properties><log4j:throwable><![CDATA[System.Xaml.XamlObjectWriterException: Failed to create a 'Settings' from the text 'Assembly references and imported namespaces serialized as XML namespaces'. ---> System.TypeLoadException: Could not load type 'System.Activities.ReferenceAssemblyDeclarationAttribute' from assembly 'System.Activities, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.
at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type)
at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
at System.Reflection.CustomAttribute.IsCustomAttributeDefined(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, RuntimeType attributeFilterType, Boolean mustBeInheritable)
at System.Reflection.CustomAttribute.IsDefined(RuntimeAssembly assembly, RuntimeType caType)
at System.Reflection.RuntimeAssembly.IsDefined(Type attributeType, Boolean inherit)
at Microsoft.VisualBasic.Activities.XamlIntegration.VisualBasicExpressionConverter.AssemblyCache.EnsureInitialized()
at Microsoft.VisualBasic.Activities.XamlIntegration.VisualBasicExpressionConverter.CollectXmlNamespacesAndAssemblies(ITypeDescriptorContext context)
at Microsoft.VisualBasic.Activities.XamlIntegration.VisualBasicSettingsConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
at MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateObjectWithTypeConverter(ServiceProviderContext serviceContext, XamlValueConverter`1 ts, Object value)
at MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateFromValue(ServiceProviderContext serviceContext, XamlValueConverter`1 ts, Object value, XamlMember property)
at System.Xaml.XamlObjectWriter.Logic_CreateFromValue(ObjectWriterContext ctx, XamlValueConverter`1 typeConverter, Object value, XamlMember property, String targetName, IAddLineInfo lineInfo)