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 had this problem when I accidentally redeclared myApp:

var myApp = angular.module('myApp',[...]);
myApp.controller('Controller1', ...);

var myApp = angular.module('myApp',[...]);
myApp.controller('Controller2', ...);

After the redeclare, Controller1 stops working and raises the OP error.