Dear Ronald,
From your post I understood that I should use connect_path() in order to make pathfinder work. This is how the last four lines look like now:
nd.connect_path(left_mmi.pin['a0'],right_mmi.pin['a0'],1,"opt")
nd.pathfinder(start=left_mmi.pin['a0'], end=right_mmi.pin['a0'])
gdsname = r'blabla'
nd.export_gds( filename=gdsname, clear=True)</pre>
This time again I have the message about lack of desired tracker type.
