PGP decrytpion error

Hi Experts,

My scenario is third party team will place the file in encrypted format and PI will pick the file and decrypt it after that we will be sending the file as an attachment to ECC inbound proxy. While picking the file I am getting the even I have maintained the correct private key,

Error:  Error: org.bouncycastle.openpgp.PGPException: A fitting private key for the encrypted data could not be found: check the password

Please help me with the error.

Thanks

Gayathri.