@wtempel Thank you so much for your kind and prompt response, I guess I solved this issue by following this discussion, I created the missed Sx session folder, then the delete project function works:
Deleting a project where the folder was already deleted fails if Live session was run,
I use the “mv Px Px-2” to rename the project folder, to import the renamed Px-2 into another CS instance, then delete the Px in its original CS instance, it showed something like “unable to delete Px: [Errno 2] No such file or directory: [path/to/project/]S1 missed”~
@stephan mentioned that this should be a bug, and will fix it later~
Thanks again!
Best,
Henry