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 09 Sep 2018 09:27:54 PM JST
gpg:                using RSA key 781BB7071C6BF648EAEB08A1100D5BFB5166E005
gpg: Can't check signature: No public key