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 Thu 21 Dec 2017 12:54:14 AM JST
gpg:                using DSA key 591E185470BE7C57CCF4516D9A6D92628FFDC942
gpg: Can't check signature: No public key