Unable to drop a table

Gurus,

In 11gR2, RHEL 4, Im getting the following err message.

I tried to drop the individual objects and indexes belongs to ggate owner, but still getting the same error.

SYS>drop user ggate cascade;
drop user ggate cascade
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-14452: attempt to create, alter or drop an index on temporary table already iin use

Please help me out on this!

Thanks,
Harry