index key not found, obj# 239, file 1, block 1674 (2)

Dear All,

I am running 10G Std One  on Solaris 10 x86.

two days back suddenly , I got the error in the alert log

ORA-00604: error occurred at recursive SQL level 1
ORA-08102: index key not found, obj# 239, file 1, block 1674 (2)
ORA-12012: error on auto execute of job 65
ORA-08102: index key not found, obj# 239, file 1, block 1674 (2)

lot of trace files generated. [ porr_j000_11653.trc]

When I checked the job , it is "EMD_MAINTENANCE.EXECUTE_EM_DBMS_JOB_PROCS()".

I followed the doc "ORA-23421: job number <job number> is not a job in the job queue" when dropping an existing job [ID 1214884.1].

But could not resolve.