SQL*Loader-128: unable to begin a session , ORA-01017: invalid username/password; logon denied

Error:
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+-----------------------------
Starting concurrent program execution...
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Arguments
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/test/TEST/apps/apps_st/appl/ce/12.0.0/CMW_HO_CNB_EXNHO_UACA0000001.csv

SQL*Loader-128: unable to begin a session
ORA-01017: invalid username/password; logon denied

Program exited with status 1
Concurrent Manager encountered an error while running SQL*Loader for your concurrent request 33142095.

Review your concurrent request log file for more detailed information.

Solution:
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1. Just Bounce the concurrent managers and if possible please bounce the Apps and the db also. As there may be some block would have happend.

If the issue still persists then Conctact Oracle Support.