I’m also facing similar issue, but with different message:
"Cannot create unknown type ‘{http://schemas.microsoft.com/netfx/2009/xaml/activities}Variable({http://schemas.uipath.com/workflow/activities}WorkbookApplication)’. "
I was looking for the solution under this post: Message: Cannot create unknown type
But all the activities are updated, and activities packages are also in the proper directory.
Can anyone refer to this messages?
Also, @teyssir are you running processes on another machine? Did you refer to the link I have uploaded above? I mean - checking activities, updates, and so on.