Passing uiapp to C#/vb.net not working ... about revitbatchprocessor

[DanRumery]

That is odd as I've just tested the variable in my own script and it does return the UIApplication instance. Perhaps can you send a sample of the task script that causes this error?

Also which version of RBP are you using?

[DanRumery]

Actually it's possible that because the document is not opened visibly in the UI, that ActiveUIDocument is null. RBP only opens the document in the UI when running a Dynamo task script.

I'm guessing you would have to do an UIApplication.OpenAndActivateDocument() first, passing the Revit file path converted to a ModelPath to the function. If the file is already detached though, then this would require first saving it as the function can't activate the document in the UI without a file path...

There is actually a hidden setting "openInUI" that you can find if you export RBP settings json file and inspect the file in a text editor. You could try setting that property to True to force python scripts to open the document in the UI.

Let me know if it helps...

[DanRumery]

Assuming you got this working because I can't replicate the issue. Closing for now.