You are gettion oracle internal error(ORA 600) which mean you could need to work wiht oracle support team. Please see below note, if its not help than i suggest log a sr:
Troubleshoot an ORA-600 or ORA-7445 Error Using the Error Lookup Tool [ID 153788.1]
I also received this error in 220.127.116.11 and was presented with this bug as the possible cause: Bug 14576583 : ORA-600 [RWORUPO.2]
ORA-600 [rworupo.2] error is reported on top of 18.104.22.168 when using the SQL Performance Analyzer (SPA).
Bug is not fixed and there are no patches as of 13/11/2012
Work around is to disable the autotask (for the job), and let it sit overnight. Then, the next day, re-enable the autotask.
I hope this helps someone.