Cannot create unknown type '{http://schemas.uipath.com/workflow/activities}LogMessage

Help Activities
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1

I think I might be having trouble with the version on the UiPath and/or packages.

The PC that I am developing the automation is 2023.10.0 and the UiPath.System.Activities version is 24.10.7.

It does run in a studio. no problems. However, when the process is uploaded in orchestrator, it does not work on my PC and the end user PC (UiPath version 2024.10.1) giving the error saying `Cannot create unknown type ‘{http://schemas.uipath.com/workflow/activities}LogMessage’.

System.Xaml.XamlObjectWriterException: Cannot create unknown type ‘{http://schemas.uipath.com/workflow/activities}LogMessage’. at System.Xaml.XamlObjectWriter.WriteStartObject(XamlType xamlType)
at System.Xaml.XamlWriter.WriteNode(XamlReader reader)
at System.Xaml.XamlServices.Transform(XamlReader xamlReader, XamlWriter xamlWriter, Boolean closeWriter)
at System.Activities.XamlIntegration.FuncFactory1.Evaluate() at System.Activities.DynamicActivity.OnInternalCacheMetadata(Boolean createEmptyBindings) at System.Activities.Activity.InternalCacheMetadata(Boolean createEmptyBindings, IList1& validationErrors)
at System.Activities.ActivityUtilities.ProcessActivity(ChildActivity childActivity, ChildActivity& nextActivity, Stack1& activitiesRemaining, ActivityCallStack parentChain, IList1& validationErrors, ProcessActivityTreeOptions options, ProcessActivityCallback callback)
at System.Activities.ActivityUtilities.ProcessActivityTreeCore(ChildActivity currentActivity, ActivityCallStack parentChain, ProcessActivityTreeOptions options, ProcessActivityCallback callback, IList1& validationErrors) at System.Activities.ActivityUtilities.CacheRootMetadata(Activity activity, LocationReferenceEnvironment hostEnvironment, ProcessActivityTreeOptions options, ProcessActivityCallback callback, IList1& validationErrors)
at System.Activities.Hosting.WorkflowInstance.ValidateWorkflow(WorkflowInstanceExtensionManager extensionManager)
at System.Activities.Hosting.WorkflowInstance.RegisterExtensionManager(WorkflowInstanceExtensionManager extensionManager)
at System.Activities.WorkflowApplication.EnsureInitialized()
at System.Activities.WorkflowApplication.Enqueue(InstanceOperation operation, Boolean push)
at System.Activities.WorkflowApplication.SimpleOperationAsyncResult.Run(TimeSpan timeout)
at System.Activities.WorkflowApplication.BeginRun(AsyncCallback callback, Object state)
at UiPath.Executor.RobotRunner.d__126.MoveNext()`

I have tried deleting the packages folder to re-install the dependencies but that did not work.

Any help would be much appreciated

2

The Log Message activity is part of the UiPath.System.Activities package. That means that the package is not installed correctly or not installed at all by the robot user in the %userprofile%/.nuget/packages.

If the robot has access to external feeds, you need to have one of these sources in the Nuget.config in the robot installation folder:

    <add key="OfficialUSNew" value="https://pkgs.dev.azure.com/uipath-us/Public.Feeds/_packaging/UiPath-Official/nuget/v3/index.json" />
    <add key="OfficialNew" value="https://pkgs.dev.azure.com/uipath/Public.Feeds/_packaging/UiPath-Official/nuget/v3/index.json" />

If you don’t have access to these sources, then you need to have all the required nupkg of dependencies in a location where the robot can retrieve (usually in the Orchestrator libraries feed).

Check in the Event Viewer logs for Application you can see some NUxxxx errors.