Lot of failed Workflows

Hello, we have a lot of failed Workflows for example the SCSM Action Log Notify Workflows. Here is an example for an error message. Any idea how I could solve this Problem? Regards Margret

A module of type "Microsoft.EnterpriseManagement.HealthService.Modules.WorkflowFoundation.WorkflowFoundationWriteActionModule" reported an exception Microsoft.EnterpriseManagement.HealthService.Modules.WorkflowFoundation.InvalidWorkflowAssemblyNameException: The value 'TroubleTicketAnalystCommentNotificationWorkflow' specified for the workflow assembly is invalid. See inner exception for information. ---> System.IO.FileNotFoundException: Could not load file or assembly 'TroubleTicketAnalystCommentNotificationWorkflow' or one of its dependencies. The system cannot find the file specified.     at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)     at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)     at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection)     at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)     at System.Reflection.Assembly.Load(String assemblyString)     at Microsoft.EnterpriseManagement.HealthService.Modules.WorkflowFoundation.WorkflowFoundationModuleUtility.DeserializeWorkflowAssembly(String assemblyName)     --- End of inner exception stack trace ---     at Microsoft.EnterpriseManagement.HealthService.Modules.WorkflowFoundation.WorkflowFoundationModuleUtility.ThrowInvalidWorkflowAssemblyNameException(Exception innerException, String assemblyName)     at Microsoft.EnterpriseManagement.HealthService.Modules.WorkflowFoundation.WorkflowFoundationModuleUtility.DeserializeWorkflowAssembly(String assemblyName)     at Microsoft.EnterpriseManagement.HealthService.Modules.WorkflowFoundation.BinaryWorkflowModuleConfiguration.DeserializeModuleConfiguration()     at Microsoft.EnterpriseManagement.HealthService.Modules.WorkflowFoundation.WorkflowFoundationWriteActionModule.ProcessNewDataItems(InputStreamStorage`1 storage) which was running as part of rule "ServiceManager.WorkflowFoundationTask" running for instance "Microsoft.SystemCenter.WorkflowFoundation.WorkflowTarget" with id:"{351A1225-D47F-D3A6-152B-5CA5B54232F6}" in management group "UniklinikRWTHAachen".