Bundler::GemRequireError when trying to run a rails app -

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while trying run rails app, getting following error

rails s -p 5000     /home/user/.rvm/gems/ruby-2.1.6/gems/tlsmail-0.0.1/lib/net/smtp.rb:806: warning: initialized constant net::smtpsession     /home/user/.rvm/gems/ruby-2.1.6/gems/tlsmail-0.0.1/lib/net/smtp.rb:806: warning: previous definition of smtpsession here     /home/user/.rvm/gems/ruby-2.1.6/gems/tlsmail-0.0.1/lib/net/pop.rb:687: warning: initialized constant net::pop     /home/user/.rvm/gems/ruby-2.1.6/gems/tlsmail-0.0.1/lib/net/pop.rb:687: warning: previous definition of pop here     /home/user/.rvm/gems/ruby-2.1.6/gems/tlsmail-0.0.1/lib/net/pop.rb:688: warning: initialized constant net::popsession     /home/user/.rvm/gems/ruby-2.1.6/gems/tlsmail-0.0.1/lib/net/pop.rb:688: warning: previous definition of popsession here     /home/user/.rvm/gems/ruby-2.1.6/gems/tlsmail-0.0.1/lib/net/pop.rb:689: warning: initialized constant net::pop3session     /home/user/.rvm/gems/ruby-2.1.6/gems/tlsmail-0.0.1/lib/net/pop.rb:689: warning: previous definition of pop3session here     /home/user/.rvm/gems/ruby-2.1.6/gems/tlsmail-0.0.1/lib/net/pop.rb:702: warning: initialized constant net::apopsession     /home/user/.rvm/gems/ruby-2.1.6/gems/tlsmail-0.0.1/lib/net/pop.rb:702: warning: previous definition of apopsession here     /home/user/.rvm/gems/ruby-2.1.6/gems/bundler-1.11.2/lib/bundler/runtime.rb:80:in `rescue in block (2 levels) in require': there error while trying load gem 'activeadmin'. (bundler::gemrequireerror)

what causes gem require error in bundler?

i hope trying load activeadmin

may problem in activeadmin

check gemfile , installation

  gem 'activeadmin'

use install activeadmin : active admin install rails 4


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