Error while decrypting file using PGP decryption in Rails

I have a client file which is encrypted using PGP encryption. The encrypted file shared is in xlsx format. The PGP private key is also shared as a text file(Note that i added .pgp extension for the private key file).

I tried decrypting the file using the below code in the rails console:

crypto = GPGME::Crypto.newGPGME::Key.import(File.open('private_key.pgp'))cipthertext = GPGME::Data.new(File.open('encrypted_file.xlsx'))data = crypto.decrypt cipthertext, {}

But the following error is coming when the last line is executed:

/.rvm/gems/ruby-3.1.2/gems/gpgme-2.0.24/lib/gpgme/ctx.rb:489:in `decrypt_verify': No secret key (GPGME::Error::NoSecretKey)

I'm using gpgme gem version 2.0.24Rails version: 7.0.8.1

I tried adding .gpg extension for the encrypted file, renaming it to 'encrypted_file.xlsx.gpg' and tried the same steps again, but still showing the same error.

Is there any issues with the code or any issues with the file extensions that i'm using?