Controller not a function, got undefined, while defining controllers globally

Question

I am writing a sample application using angularjs. i got an error mentioned below on chrome browser.

Error is

Error: [ng:areq] http://errors.

Answer 1

I am a beginner with Angular and I did the basic mistake of not including the app name in the angular root element. So, changing the code from

to

worked for me. @PSL, has covered this already in his answer above.