PGP Return Code 163

We have been using pgp command line to encrypt and sign files for over a year and this week we started receiving the below error. Can someone please explain what the PGP Return code of 163 is and how to resolve?

encrypt (3090:operation failed, file not found)

PGP Return Code 163

Below is what we are using to encrypt and sign.

echo 'In encryptPGP.bat'
set INfile=%1
set PGPfile=%2
set PGP_USER=%3
set PGP_SIGN=%4
echo %PGP_PATH% --encrypt %INfile% --recipient %PGP_USER% --sign %PGP_SIGN% --output %PGPfile%
%PGP_PATH% --encrypt %INfile% --recipient %PGP_USER%  --sign %PGP_SIGN% --passphrase ************** --output %PGPfile%
set err=%errorlevel%
echo PGP Return Code %err%