Fatal error: Uncaught Error: Class 'Psr\Log\AbstractLogger' not found in D:\xampp\htdocs\psp\backend\vendor\psr\log\Psr\Log\Test\TestLogger.php:57 Stack trace: #0 {main} thrown in D:\xampp\htdocs\psp\backend\vendor\psr\log\Psr\Log\Test\TestLogger.php on line 57