JR, much has changed in the way ULib stores data for its groups, users and registered commands.
Once you upgraded to SVN, did you at any point in time copy over the files in your gmod/data/ULib directory with old files from Pre-SVN?
It looks as though you have corrupted gmod/data/ULib files, or have edited addons/ULib/data/Ulib files and shouldn't have.
Just as a test, shut down your server (test or otherwise), remove your gmod/data/ULib folder, restart server and let it rebuilt.
May try clean SVN checkout again too. Might have mixed files.
Did you also get SVN of ULX I presume you're using SVN of ULib, or I believe URestrict would complain similarly.