fixed login get user by username

src/Auth/DataAccess/LuticateUsersDataAccess.php

      */
     public static function getByUsername($username)
     {
-        $user = LuticateUsers::where("username", "=", $username);
+        $user = LuticateUsers::where("username", "=", $username)->first();
         if (is_null($user))
             return null;
         return $user->toDbo();