The error message that HTCondor gives if a user has not stashed a password is of the form:
ERROR: No credential stored for username@machinename
Correct this by running:
condor_store_cred add
Why Windows Credential Errors
Jobs submitted from a Windows machine require a stashed password in
order for HTCondor to perform certain operations on the user's behalf.
RThe command which stashes a password for a user
is condor_store_cred. See the manual page for usage details.