PGP Command Line: Error 164

Hi Team,

A member of partner team shared me a PGP Public Key to encrypt a file, then when I encrypted the file I will send it again and they will decrypt  with their private key.

When they decrypt the file, they have an error: PGP 164 Error.

So, I want to know If I have to SIgn and Verify the Public key?

I look forward your response,