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 Sun 22 Oct 2017 06:09:03 PM JST
gpg:                using RSA key C66FB5C771CA9F3C
gpg: Can't check signature: No public key
==> BAD/TAMPERED signature detected! <==