psspy.case() giving error "Not open for physical access."
When I'm trying to initialize my case with the following code the "psspy.case" command results in a message back to the console stating "Not open for physical access. C:\PTI\case.sav (RWFIL/CASE)"
I can't find anything anywhere about what this means. Can anyone shed some light on this? Thanks
ierr = psspy.psseinit(12000)
print(ierr)
psspy.case(r'C:\PTI\case.sav')