Could not open logfile" occurred when run "datapatch -verbose"

CAUSE

Due to Bug 25459405 - DATAPATCH FAILS WITH SP2-0768 IF NLS_LANGUAGE IS NOT SET TO AMERICAN
which is under investigation.

SOLUTION

 1. Set the NLS_LANG to American_America temporarily.
eg:
NLS_LANG=American_America.US8PC437

2. Run the "datapatch -verbose" command.