A .jp domain fails to register with the Onamae plug-in, the following error is in logs.
[2016/11/30 21:58:42] [ERROR]  [HSPC::MT::DM::report_to_action_log] Domain domain_name.jp. Error occurred while registration. Error: Error result: code '20000', message 'Failed in command with error.'.
Please contact Onamae support directly in order to clarify the reason of such error message and error result code.