BadRequirementError, Illformed requirement, fail to install offline logstash java plugin for the version reason or others?

I've packed logstash offline java plugin but the plugin can not be well installed.
it may be caused by wrong version. The offline plugin was built by prepare-offline-pack command but plugin name has to be set to logstash*(wildcard) that logstash can find the installed online logstash java plugin and named it as logstash-offline-plugins-7.9.0, otherwise it can not find installed online logstash java plugin even with the --output parameters.
Could some expert help to give some advice?

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