Errors

meta_yml_conforms_to_known_spec

License 'gpl_3' is invalid (license) [Validation: 1.4]

valid_signature

Old SIGNATURE detected. Please inform the module author to regenerate SIGNATURE using Module::Signature version 0.82 or newer.
gpg: Signature made Tue 12 Jun 2018 10:41:01 PM JST
gpg:                using DSA key 51DB8158F99E7A0FF6323ECEF3DD7867BA53F93F
gpg: Can't check signature: No public key