Object reference not set to an instance of an object for simple Activity

Hi all, I have a problem that is driving me nuts. I am encountering the following error-message: " Object reference not set to an instance of an object"

I have an empty activity, completly empty, which runs fine when empty. But the moment when I add any activity it throws the error. Like here, I add a simple log acitivity, then it fails:

image

20.10.4+Branch.master.Sha.6a6cfd6dfbeb86aec47564af2f9465ef0bf43df4

Source: Invoke Process workflow

Message: Compilation failures occurred: 

	An object reference is required for the non-static field, method, or property 'Process_CompiledExpressionRoot.Process_CompiledExpressionRoot_TypedDataContext2.System.get'	An object reference is required for the non-static field, method, or property 'Process_CompiledExpressionRoot.Process_CompiledExpressionRoot_TypedDataContext2.System.get'	An object reference is required for the non-static field, method, or property 'Process_CompiledExpressionRoot.Process_CompiledExpressionRoot_TypedDataContext2_ForReadOnly.System.get'	An object reference is required for the non-static field, method, or property 'Process_CompiledExpressionRoot.Process_CompiledExpressionRoot_TypedDataContext2_ForReadOnly.System.get'

Complete results are contained in the Data property of this exception.  Please correct the errors in the source and retry the Load.

Exception Type: System.InvalidOperationException

RemoteException wrapping System.InvalidOperationException: Compilation failures occurred: 

	An object reference is required for the non-static field, method, or property 'Process_CompiledExpressionRoot.Process_CompiledExpressionRoot_TypedDataContext2.System.get'	An object reference is required for the non-static field, method, or property 'Process_CompiledExpressionRoot.Process_CompiledExpressionRoot_TypedDataContext2.System.get'	An object reference is required for the non-static field, method, or property 'Process_CompiledExpressionRoot.Process_CompiledExpressionRoot_TypedDataContext2_ForReadOnly.System.get'	An object reference is required for the non-static field, method, or property 'Process_CompiledExpressionRoot.Process_CompiledExpressionRoot_TypedDataContext2_ForReadOnly.System.get'

Complete results are contained in the Data property of this exception.  Please correct the errors in the source and retry the Load. 
   at System.Activities.XamlIntegration.ActivityXamlServices.Compile(IDynamicActivity dynamicActivity, LocationReferenceEnvironment environment)
   at System.Activities.XamlIntegration.ActivityXamlServices.Load(XamlReader xamlReader, ActivityXamlServicesSettings settings)
   at System.Activities.XamlIntegration.ActivityXamlServices.Load(XmlReader xmlReader, ActivityXamlServicesSettings settings)
   at System.Activities.XamlIntegration.ActivityXamlServices.Load(Stream stream, ActivityXamlServicesSettings settings)
   at UiPath.Executor.WorkflowRuntime.Load(String workflowFile)
   at UiPath.Executor.InProcessRunner.BeginExecute(AsyncCallback callback, Object state)
   at UiPath.Core.Activities.ExecutorInvokeActivity.BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, Object state)
   at System.Activities.AsyncCodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager)
   at System.Activities.ActivityInstance.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)
   at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)

EDIT: Nevermind, I had a variable with the name “System”. When I removed that everything works. Forgot that it is a protected name (at least I assume it is).

I had a variable with the name “System”. When I removed that everything works. Forgot that it is a protected name (at least I assume it is).

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