error while running gtk-api

[VivekJaganath]

i am running below error while running gtk-api.

/app/models/mano_manager_service.rb:34: warning: previous definition of LOG_MESSAGE was here

• Gracefully stopping, waiting for requests to finish ! Unable to load application: NoMethodError: undefined method stop' for nil:NilClass bundler: failed to load command: puma (/usr/local/bundle/bin/puma) NoMethodError: undefined methodstop' for nil:NilClass /usr/local/bundle/gems/puma-3.11.0/lib/puma/single.rb:28:in stop_blocked' /usr/local/bundle/gems/puma-3.11.0/lib/puma/launcher.rb:291:ingraceful_stop' /usr/local/bundle/gems/puma-3.11.0/lib/puma/launcher.rb:395:in block in setup_signals' /app/gtk_api.rb:112:inkill' /app/gtk_api.rb:112:in block in <class:GtkApi>' /app/gtk_api.rb:98:ineach' /app/gtk_api.rb:98:in <class:GtkApi>' /app/gtk_api.rb:53:in<top (required)>' config.ru:28:in require' config.ru:28:inblock in
  ' /usr/local/bundle/gems/rack-2.0.7/lib/rack/builder.rb:55:in instance_eval' /usr/local/bundle/gems/rack-2.0.7/lib/rack/builder.rb:55:ininitialize' config.ru:in new' config.ru:in

  ' /usr/local/bundle/gems/rack-2.0.7/lib/rack/builder.rb:49:in eval' /usr/local/bundle/gems/rack-2.0.7/lib/rack/builder.rb:49:innew_from_string' /usr/local/bundle/gems/rack-2.0.7/lib/rack/builder.rb:40:in parse_file' /usr/local/bundle/gems/puma-3.11.0/lib/puma/configuration.rb:318:inload_rackup' /usr/local/bundle/gems/puma-3.11.0/lib/puma/configuration.rb:243:in app' /usr/local/bundle/gems/puma-3.11.0/lib/puma/runner.rb:138:inload_and_bind' /usr/local/bundle/gems/puma-3.11.0/lib/puma/single.rb:87:in run' /usr/local/bundle/gems/puma-3.11.0/lib/puma/launcher.rb:183:inrun' /usr/local/bundle/gems/puma-3.11.0/lib/puma/cli.rb:77:in run' /usr/local/bundle/gems/puma-3.11.0/bin/puma:10:in<top (required)>' /usr/local/bundle/bin/puma:29:in load' /usr/local/bundle/bin/puma:29:in<top (required)>'