Redmine

when i execute rake command, am getting error as below

1. rake -f /opt/redmine-2.4.2-0/apps/redmine/htdocs/Rakefile redmine:email:receive_imap RAILS_ENV="production"
   host = mail.mycompany.com username=redmine@mail.mycompany.com password=redmine

----------------
rake aborted!
cannot load such file -- bundler/setup
/usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/opt/redmine-2.4.2-0/apps/redmine/htdocs/config/boot.rb:6:in `<top (required)>'
/usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/opt/redmine-2.4.2-0/apps/redmine/htdocs/config/application.rb:1:in `<top (required)>'
/usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/local/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/opt/redmine-2.4.2-0/apps/redmine/htdocs/Rakefile:5:in `<top (required)>'
/usr/local/lib/ruby/gems/2.1.0/gems/rake-10.1.1/lib/rake/rake_module.rb:25:in `load'
/usr/local/lib/ruby/gems/2.1.0/gems/rake-10.1.1/lib/rake/rake_module.rb:25:in `load_rakefile'
/usr/local/lib/ruby/gems/2.1.0/gems/rake-10.1.1/lib/rake/application.rb:637:in `raw_load_rakefile'
/usr/local/lib/ruby/gems/2.1.0/gems/rake-10.1.1/lib/rake/application.rb:94:in `block in load_rakefile'
/usr/local/lib/ruby/gems/2.1.0/gems/rake-10.1.1/lib/rake/application.rb:165:in `standard_exception_handling'
/usr/local/lib/ruby/gems/2.1.0/gems/rake-10.1.1/lib/rake/application.rb:93:in `load_rakefile'
/usr/local/lib/ruby/gems/2.1.0/gems/rake-10.1.1/lib/rake/application.rb:77:in `block in run'
/usr/local/lib/ruby/gems/2.1.0/gems/rake-10.1.1/lib/rake/application.rb:165:in `standard_exception_handling'
/usr/local/lib/ruby/gems/2.1.0/gems/rake-10.1.1/lib/rake/application.rb:75:in `run'
/usr/local/lib/ruby/gems/2.1.0/gems/rake-10.1.1/bin/rake:33:in `<top (required)>'
/usr/local/bin/rake:23:in `load'

--------------------
[root@linux redmine]# which rake
/usr/local/bin/rake
[root@linux redmine]# rake -V
rake, version 10.1.1

--------------
Environment:
Redmine version 2.4.2.stable
Ruby version 1.9.3-p484 (2013-11-22) [i686-linux]
Rails version 3.2.16
Environment production
Database adapter Mysql2
SCM:
Subversion 1.8.4
Git 1.8.3
Filesystem
Redmine plugins:
no plugin installed

pls advice how to proceed .... you still need any more details to help.
thanks.