I know this is a common problem but I haven't been able to find a solution by reading through previously asked questions.
I'm actually getting two errors but the first one is about angular not being able to find my controller.
http://errors.angularjs.org/1.4.2/$injector/nomod?p0=myApp.controllers
My directory structure looks like the following:
.
└── static
    ├── index.html
    ├── js
    │   ├── app.js
    │   └── controllers.js
    ├── lib
    │   └── angular-ui-router.min.js
    └── partials
        ├── view1.html
        └── view2.html
My index file looks like the following:
<html ng-app="myApp">
    <head>
        <meta charset="UTF-8">
        <title>Hello AngularJS</title>
    </head>
    <body>
        <div ui-view></div>
        <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.2/angular.min.js"></script>
        <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.2/angular-route.min.js"></script>
        <script type="text/javascript" src="lib/angular-ui-router.min.js"></script>
        <script type="text/javascript" src="js/controllers.js"></script>
        <script type="text/javascript" src="js/app.js"></script>
    </body>
</html>
My app.js file looks like the following:
(function(angular) {
    var app = angular.module('myApp', ['ui.router', 'myApp.controllers']);
    app.config(function($stateProvider) {
        $stateProvider.state('view1', {
            url: '/view1',
            templateUrl: 'partials/view1.html',
            controller: 'View1Controller'
        }).state('view2', {
            url: '/view2',
            templateUrl: 'partials/view2.html',
            controller: 'View2Controller'
        });
    }).run(function($state) {
        $state.go('view2');
    });
})(angular);
My controller.js file looks like the following:
(function(angular) {
    var app = angular.module('myApp.controllers');
    app.controller('View1Controller', function($scope) {
        $scope.data = 'my view 1';
    });
    app.controller('View2Controller', function($scope) {
        $scope.data = 'my view 2';
    });
})(angular);
Also a second error which might be related.
As stated above angular is unable to find my controller. Does anyone have a clue about what I'm doing wrong? Please let me know if I need to paste more code.
I've shared the code on github in case someone finds it easier to deal with.
https://github.com/tonsV2/angular-ui.route/tree/master/src/main/resources/static
In angular angular.module() is a setter and a getter. According to the angular.module docs (via @DanAtkinson's comment):
Passing one argument retrieves an existing angular.Module, whereas passing more than one argument creates a new angular.Module.
Getter
var app = angular.module('myApp.controllers'); uses module as a getter. 
It fails because the module myApp.controllers haven't been created yet.
Setter
To use it as a setter change it to
var app = angular.module('myApp.controllers', []); // note the []
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