Ruby issue while configuring sensu checks

I have sensu server and sensu-client Installed on one machine (centos)
and installed the the plugins through gem.

Everything was good when I run the check_ping.rb from the command line,
but When I configure the same check in /etc/sensu/conf.d/ and check in
the UI I am getting this ruby issue;

gem install sensu-plugins-network-checks

I have ruby installed of 1.9.3 version

and configured EMBEDDED_RUBY=true

when I check the UI the below is the error I am facing

/opt/sensu/embedded/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
`require': cannot load such file -- net/ping (LoadError)
from
/opt/sensu/embedded/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
`require'
from
/usr/local/rvm/gems/ruby-1.9.3-p551/gems/sensu-plugins-network-checks-0.2.4/bin/check-ping.rb:31:in
`<main>'
Sensu::Plugin::CLI: ["Not implemented! You should override
Sensu::Plugin::CLI#run."]