Execution Error Cannot create unknown type

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Hey,
When i run a Process on the machine via UiPath Studio it works flawlessly, however when i try and run it on the same machine via Orchestrator it fails instantly. I get the following error:

“Execution error : System.Xaml.XamlObjectWriterException: Cannot create unknown type ‘{http://schemas.uipath.com/workflow/activities}GetOutlookMailMessages’.\r\n at System.Xaml.XamlObjectWriter.WriteStartObject(XamlType xamlType)\r\n at System.Xaml.XamlWriter.WriteNode(XamlReader reader)\r\n at System.Xaml.XamlServices.Transform(XamlReader xamlReader, XamlWriter xamlWriter, Boolean closeWriter)\r\n at System.Activities.XamlIntegration.FuncFactory1.Evaluate()\r\n at System.Activities.DynamicActivity.OnInternalCacheMetadata(Boolean createEmptyBindings)\r\n at System.Activities.Activity.InternalCacheMetadata(Boolean createEmptyBindings, IList1& validationErrors)\r\n at System.Activities.ActivityUtilities.ProcessActivity(ChildActivity childActivity, ChildActivity& nextActivity, Stack1&amp; activitiesRemaining, ActivityCallStack parentChain, IList1& validationErrors, ProcessActivityTreeOptions options, ProcessActivityCallback callback)\r\n at System.Activities.ActivityUtilities.ProcessActivityTreeCore(ChildActivity currentActivity, ActivityCallStack parentChain, ProcessActivityTreeOptions options, ProcessActivityCallback callback, IList1&amp; validationErrors)\r\n at System.Activities.ActivityUtilities.CacheRootMetadata(Activity activity, LocationReferenceEnvironment hostEnvironment, ProcessActivityTreeOptions options, ProcessActivityCallback callback, IList1& validationErrors)\r\n at System.Activities.Hosting.WorkflowInstance.ValidateWorkflow(WorkflowInstanceExtensionManager extensionManager)\r\n at System.Activities.Hosting.WorkflowInstance.RegisterExtensionManager(WorkflowInstanceExtensionManager extensionManager)\r\n at System.Activities.WorkflowApplication.EnsureInitialized()\r\n at System.Activities.WorkflowApplication.Enqueue(InstanceOperation operation, Boolean push)\r\n at System.Activities.WorkflowApplication.SimpleOperationAsyncResult.Run(TimeSpan timeout)\r\n at System.Activities.WorkflowApplication.BeginRun(AsyncCallback callback, Object state)\r\n at UiPath.Executor.RobotRunner.<>c__DisplayClass54_0.<OnInvokeJob>b__0()”

Since it fails at GetOutlookMailMessages i reinstalled the mail package but still no luck.
Any advise is appreciated.

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Hi @ZacCoop…
Check whether json file is getting updated or not when you are updating the packages. And also check the activity packages are placed in the right directory or not.!!

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Hi @ZacCoop

You can search the forum for similar error message “Cannot create unknown type (…)”. The solution is easily available :slight_smile:

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