yii2在控制器页面中找不到自定义操作

Question

namespace app\Controllers;

use Yii;
use app\models\Projects;
use app\models\ProjectSearch;
use app\models\Employees;
use yii\web\Controller;
use yii\web\NotFoundHttpException;
use yii\filters\VerbFilter;

/**
 * ProjectController implements the CRUD actions for Projects model.
 */
class ProjectController extends Controller
{
    public function behaviors()
    {
        return [
            'verbs' => [
                'class' => VerbFilter::className(),
                'actions' => [
                    'delete' => ['post'],

                ],
            ],
        ];
    }

    public function actionGetAvailableEmployees($id=null){
        $available_employees = Projects::getAvailableEmployees($id);
        return json_encode($available_employees);
    }


}

My /config/web.php is this:

 'urlManager'=>array(
        'enablePrettyUrl'=>'true',
        'showScriptName'=>false,
        'rules'=>array(
            '' => '/',
            '<action:(index|page|contact|login|logout|NotAllowed)>'=>'site/<action>',
            '<controller:\w+>/<id:\d+>'=>'<controller>/view',
            '<controller:\w+>/<action:\w+>/<id:\d+>'=>'<controller>/<action>',
            '<controller:\w+>/<action:\w+>'=>'<controller>/<action>',
        ),
    ),

When i try to access the url with this http://mysite.dev/project/get-available-employees/1 I am getting a page not found error, what seems to be the problem here? I am new to Yii2.

Thanks!