WWW-Google-CustomSearch 0.19

Errors

valid_signature
Old SIGNATURE detected. Please inform the module author to regenerate SIGNATURE using Module::Signature version 0.82 or newer.
gpg: Signature made Sat 11 Oct 2014 07:31:38 AM JST
gpg:                using RSA key DA172575A8EC2FE9
gpg: Can't check signature: No public key
==> BAD/TAMPERED signature detected! <==