How to find a reason AngularJS “Argument ‘MyCtrl’ is not a function, got undefined”

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  1. Is file with ‘MyCtrl’ connected via html? (check twice if you concat or uglify your files)
<script src="https://stackoverflow.com/questions/26797756/path/to/controllers.js"></script>
  1. Is ‘MyCtrl’ defined correctly?

There are a few patterns:

app.controller('MyCtrl', ['$scope', function ($scope) {...}])

app.controller('MyCtrl', function ($scope) {...})

var MyCtrl = function ($scope) {...})
  1. Is ‘MyCtrl’ defined in right module?
  2. Is “MyCtrl’s” module added to app dependencies?
angular.module('app', ['app.sources']);

  1. If you define your module multiple times, you should define it in this order:

    • First define should be like 
angular.module('app.sources', []);

(with [ ])

  • Subsequent defines should be like 
angular.module('app.sources');

(without [ ])

Important: Declaration order is important – definition with [ ] should go first.

  1. Check that module is defined only once.
    You may have forgotten to rename module after copy-paste. Check src for string like 
angular.module('app.sources', []);

  1. Check your 'ng-app'. Better to use only one of these with name like ng-app='app' (In other words do not define multiple unnamed ngApp directives)

  2. Is your controller’s syntax correct for your AngularJS version?

(There is a difference between definition in Angular 1.0.x and 1.2.x and higher. With Angular versions greater than 1.3.x, you cannot declare a global constructor function and use it with ng-controller)

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