Error reading plugin file /path/to/logstash-input-mongodb.gem, caused by Gem::Package::FormatError

[hmzdrzql]

bin/logstash-plugin install --no-verify /home/logstash-input-mongodb/logstash-input-mongodb.gem Gem::Package::FormatError: package metadata is missing in /home/logstash-input-mongodb/logstash-input-mongodb.gem verify_files at /home/logstash/vendor/jruby/lib/ruby/stdlib/rubygems/package.rb:599 block in verify at /home/logstash/vendor/jruby/lib/ruby/stdlib/rubygems/package.rb:524 new at /home/logstash/vendor/jruby/lib/ruby/stdlib/rubygems/package/tar_reader.rb:29 block in verify at /home/logstash/vendor/jruby/lib/ruby/stdlib/rubygems/package.rb:521 open at org/jruby/RubyIO.java:1156 open at org/jruby/RubyKernel.java:306 with_read_io at /home/logstash/vendor/jruby/lib/ruby/stdlib/rubygems/package/file_source.rb:30 verify at /home/logstash/vendor/jruby/lib/ruby/stdlib/rubygems/package.rb:520 extract_files at /home/logstash/vendor/jruby/lib/ruby/stdlib/rubygems/package.rb:335 unpack at /home/logstash/lib/bootstrap/rubygems.rb:74 block in extract_local_gems_plugins at /home/logstash/lib/pluginmanager/install.rb:172 collect at org/jruby/RubyArray.java:2481 extract_local_gems_plugins at /home/logstash/lib/pluginmanager/install.rb:162 execute at /home/logstash/lib/pluginmanager/install.rb:53 run at /home/logstash/vendor/bundle/jruby/2.3.0/gems/clamp-0.6.5/lib/clamp/command.rb:67 execute at /home/logstash/vendor/bundle/jruby/2.3.0/gems/clamp-0.6.5/lib/clamp/subcommand/execution.rb:11 run at /home/logstash/vendor/bundle/jruby/2.3.0/gems/clamp-0.6.5/lib/clamp/command.rb:67 run at /home/logstash/vendor/bundle/jruby/2.3.0/gems/clamp-0.6.5/lib/clamp/command.rb:132

at /home/logstash/lib/pluginmanager/main.rb:48