Dan in CA
There was an update just before the 9/23 one which had that problem.
If you try to check the rev page by adding /rev to the URL of the program you should get a page with a few lines of text that should include
ospi.py revision: 135
If it says revision 134 or you get a not found error, you just need to update to the latest version.
If you are running revision 135 and are still getting the error, please let me know.