The closest I could find is:
"ORA-00060 deadlock detected while waiting for resource"
Transaction 1 locks row A, then Transaction 2 locks row B. Then Transaction 1 tries to lock Row B and transaction 2 tries to lock row A.
I don't know if that's related to your problem, but it's the only results that Google yielded after fiddling with the query string. Doing a query on Google for "Oracle error ROW-00060" only returned this post - which almost never happens...