Error configuring google drive location in snapshot

I tried to configure a google drive location in snapshot. Pasted the drive key, clicked save destination, and got this error:

The requested URL /culvert-luxuriant.php was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Once that error shows up, I cannot get in to ANY dashboard item. I have to use Firefox history to go back to a page before the snapshot action.
Pretty urgent.