Errors

use_warnings

Net::SFTP, Net::SFTP::Attributes, Net::SFTP::Buffer, Net::SFTP::Constants, Net::SFTP::Util

valid_signature

Old SIGNATURE detected. Please inform the module author to regenerate SIGNATURE using Module::Signature version 0.82 or newer.
gpg: Signature made Wed 28 Jun 2017 06:52:46 AM JST
gpg:                using RSA key 2DEF49B5C0B11DBE
gpg: Can't check signature: No public key