full calendar doesn't display in browser

I am trying to create full calendar in web application. But the calendar doesn't display in browser. I don't know what should i do? I follow the code in https://fullcalendar.io/docs/usage/ and i tray to test it in http://jsfiddle.net and it work.However, When i test the web app, it doesn't give any error only empty whit page in both chrome and explorer . hope you know the reason.