Error while starting rails server

I am getting following error while starting server:

/usr/local/rvm/gems/ruby-1.9.3-p551/gems/railties-3.1.6/lib/rails/script_rails_loader.rb:11: warning: Insecure world writable dir /u01/app/oracle/product/11.2.0/dbhome_1/bin in PATH, mode 040777 /usr/lib/ruby/vendor_ruby/bundler.rb:289: warning: Insecure world writable dir /u01/app/oracle/product/11.2.0/dbhome_1/bin in PATH, mode 040777 /usr/local/rvm/gems/ruby-1.9.3-p551/gems/activesupport-3.1.6/lib/active_support/values/time_zone.rb:270: warning: circular argument reference - now /usr/local/rvm/gems/ruby-1.9.3-p551/gems/nokogiri-1.6.8/lib/nokogiri.rb:32:inrequire': incompatible library version - /usr/local/rvm/gems/ruby-1.9.3-p551/gems/nokogiri-1.6.8/lib/nokogiri/nokogiri.so (LoadError) from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/nokogiri-1.6.8/lib/nokogiri.rb:32:in rescue in ' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/nokogiri-1.6.8/lib/nokogiri.rb:28:in' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/roo-1.13.2/lib/roo/excelx.rb:2:in require' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/roo-1.13.2/lib/roo/excelx.rb:2:in' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/simple-spreadsheet-0.3.1/lib/simple-spreadsheet/classes/excelx_extended.rb:1:in require' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/simple-spreadsheet-0.3.1/lib/simple-spreadsheet/classes/excelx_extended.rb:1:in' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/simple-spreadsheet-0.3.1/lib/simple-spreadsheet.rb:77:in require' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/simple-spreadsheet-0.3.1/lib/simple-spreadsheet.rb:77:in' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/simple-spreadsheet-0.3.1/lib/simple-spreadsheet.rb:4:in ' from /usr/lib/ruby/vendor_ruby/bundler/runtime.rb:77:inrequire' from /usr/lib/ruby/vendor_ruby/bundler/runtime.rb:77:in block (2 levels) in require' from /usr/lib/ruby/vendor_ruby/bundler/runtime.rb:72:ineach' from /usr/lib/ruby/vendor_ruby/bundler/runtime.rb:72:in block in require' from /usr/lib/ruby/vendor_ruby/bundler/runtime.rb:61:ineach' from /usr/lib/ruby/vendor_ruby/bundler/runtime.rb:61:in require' from /usr/lib/ruby/vendor_ruby/bundler.rb:99:inrequire' from /home/akashk/projects/cymonz-web/rails/config/application.rb:11:in ' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/railties-3.1.6/lib/rails/commands.rb:52:inrequire' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/railties-3.1.6/lib/rails/commands.rb:52:in block in ' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/railties-3.1.6/lib/rails/commands.rb:49:intap' from /usr/local/rvm/gems/ruby-1.9.3-p551/gems/railties-3.1.6/lib/rails/commands.rb:49:in ' from script/rails:6:inrequire' from script/rails:6:in '