Notice: Undefined variable: router in G:\projects\beta.api.edutalk.edu.vn\routes\backend.php on line 15

Fatal error: Uncaught Error: Call to a member function get() on null in G:\projects\beta.api.edutalk.edu.vn\routes\backend.php:15 Stack trace: #0 {main} thrown in G:\projects\beta.api.edutalk.edu.vn\routes\backend.php on line 15