I got this error today while trying to run jBPM drop/create scripts.
I didn't know Oracle had a recycle bin?
Theoretically the solution is to run, "purge recyclebin;" and wait. I say theoretically because my solution required dropping and recreating the user. Somehow my foreign keys didn't get moved to the recycle bin at the same time as my tables.
Additionally the "purge" command needs to be added to delete statements.