Wanting to use ghpythonlib.parallel.run to speed up boolean operations

I’m trying to harness the power of ghpythonlib.parallel.run to speed up a bunch of boolean differencing I’m having to do on a project, however I’m not great at scripting. I’m getting an Argument Type Exception error that i’m a little stumped as to how to solve:

I attached my script if anyone out their fancies taking a stab. Any help would be greatly appreciated!

Cheers,

Darcy
181106_quikBool.gh (198.0 KB)