Informatica job via UNIX script problem

I am getting following error when i tried to run Informatica job through a UNIX script.
The error is
ERROR: Invalid user name or password.
WARNING: Lost server connection.

The user name and password is correctly entered and there is no discrepancy regarding that.

The Unix log file says
2007 OPALD31_LOAD_PLINK_ANNUALSTATEMENT.ksh FATAL ERROR - Se
ssion Failed, batch w_m_OPAL_PLINK_Annual Statement_load_to_stage, rc=7.

No WKFLOWLOGS or SESSLOGS are getting created