Error: [ng:areq] Argument 'Controller' is not a function, got undefined - angularjs

Question

While implementing a modal for dialog boxes I am getting Error: [ng:areq] Argument 'ModalInstanceCtrl' is not a function, got undefined. I have two controllers in the same .js file. The error shows up the name of the second controller.
ng-app is contained in main html file.
<div ng-app = "LoginApp">
<div ng-view>
<!-- partial will go here -->
</div>
</div>
Angular routes
var LoginApp = angular.module('LoginApp', ['ngResource', 'ngRoute', 'ui.bootstrap'])
LoginApp.config(function($routeProvider, $locationProvider) {
$routeProvider
.when('/', {controller: LoginCtrl, templateUrl: '/js/templates/login.html'})
.otherwise({redirectTo: '/'})
$locationProvider.html5Mode({
enabled: true,
requireBase: false
});
})
LoginCtrl.js file
'use strict'
var LoginCtrl = ['$scope', '$modal', '$log', function($scope, $modal, $log) {
$scope.authenticate = function(){
var loginModal = $modal.open({
templateUrl: 'login-modal.html',
controller: 'ModalInstanceCtrl',
resolve: {
modalData: function () {
return {
user: {
name: '',
password: ''
}
};
}
}
});
loginModal.result.then(function (user) {
$log.info("My name is:" + user.name);
}, function () {
$log.info('Modal dismissed at: ' + new Date());
});
}
}];
var ModalInstanceCtrl = ['$scope', '$modalInstance', 'modalData', function($scope, $modalInstance, modalData){
}];
In the LoginCtrl.js file, LoginCtrl doesn't shows up this error but the declaration of ModalInstanceCtrl is undefined. Could anyone let me know why is this happening.

Answer 1

In the param of $modal.open(), change from this:
...
controller: 'ModalInstanceCtrl',
...
To this:
...
controller: ModalInstanceCtrl,
...
Notice, no quotes for the name of the controller, because you want AngularJS to use the ModalInstanceCtrl variable, not a controller registered with angular.
Alternatively, if you want to keep the quotes, you can register ModalInstanceCtrl with AngularJS, like this:
LoginApp.controller('ModalInstanceCtrl', ['$scope', '$modalInstance', 'modalData', function($scope, $modalInstance, modalData){
...
}]);
Either way will work.