Why is PRepS complaining about database schema versions?
The version of PRepS you are running is not compatible with the PRepS database you are attempting to connect to. One of two things happened: your database was updated, but you never installed a newer version of PRepS, or you installed a new version of PRepS but did not run update_prepsdb on the existing PRepS databases. In the former case, install a newer version of PRepS. In the latter case, update your database.