The following error occured when submitting the backup job through OEM in 10.2.0.4 database


'Full_Bkp_orcl_000303': ORA-20900: Could not find credential set DBHostCreds for target type oracle_database ORA-06512:
at "SYSMAN.MGMT_CREDENTIAL", line 649 ORA-06512: at
"SYSMAN.MGMT_CREDENTIAL", line 1309 ORA-06512:
at "SYSMAN.MGMT_JOBS", line 263 ORA-06512:
at "SYSMAN.MGMT_JOBS", line 48 ORA-06512: at line 1


I am using RHEL-5 OS


Please help.