When I go to save my program I’ve created I get an error saying my program can’t be saved.
Error says “Ensure the selected save directory exists. If it is an external storage device, then verify it is attached.”
I’m not able to navigate to a different directory or create a new folder when I click “Save Program As” either…
When I click the “Add folder” icon, I get a “Caught unhandled Exception!” report.
the / typically represents a directory. Remove that and you should be good.
I didn’t include the / in the program name…it just showed up in the error dialoged.
Uh oh. Something not right… 
:edit: WOWzers. UR has a pregnant man emogi. 
I’m currently having the same issue in Polyscope. Same error message. This showed up after opening up the existing program, introducing new lines, and then trying to save. The new lines of code pertained to pose math, pose transforms, etc. Have you found out what the source of your error was?