Page not found and authorization error while running server using workspace


I am a happy user of Cloud 9 and loves to develop applications using it. However, recently I encountered an authentication related bug while trying to execute the localhost server. First, I discovered this while working on ‘RubyonRails’ with my friend on his account. I had never experienced such thing on C9 but then I also got the same error while working on Meteor!

Please help me guys!