Error during job execution: "invalid username/password" (4221174)

After creating a job for new object creation, the test for connection is working successfully. However, when job is executed the following error is shown and job does not run:

"Job Started Starting Agent(s) on xxx Started test Create Objects for TPC-C Checking for existing objects... Unable to begin a session for user 'system'. Login failed for user 'system', invalid username/password. Could not logon to the server. Login failed for user 'system', invalid username/password. Test cancelled due to errors. "