Angular: Controller is undefined when adding a directive

Question

I get the following error when adding a directive to my site:

Error: [ng:areq] Argument \'MainController\' is not a function, got undefined

The

Answer 1

passing a 2nd argument like this angular.module('my-app', []) creates a new module, use it only once.

To retrive a module use var module = angular.module('my-app') and use module.controller(... or module.directive(.... etc.,