ReferenceError: angular is not defined

(function ()
{
'use strict';

angular
.module('app.pages.auth.login')
.controller('LoginController', LoginController);

/** @ngInject */
function LoginController($scope, $state, api, $localStorage, $sessionStorage)
{
// Data
console.log('vm', $scope.vm);
$scope.loginStatus = {
err : false,
message : ''
}

// Methods
$scope.signin = function () {
var data = angular.copy($scope.vm.form);
data.userType = 1; //admin
console.log('vm', $scope.vm);
api.auth.signin.save(data, function(res){
console.log(res);
var obj = angular.copy(res);
api.setProfile(obj);

$state.go('app.accounts');
}, function(err){
console.log(err.data.message);
$scope.loginStatus.err = true;
$scope.loginStatus.message = err.data.message;
});
}
//////////
}
})();