Fatal error: Uncaught Error: Interface "Amp\Sync\KeyedMutex" not found in C:\xampp\htdocs\mflux\vendor\amphp\sync\src\PrefixedKeyedMutex.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\mflux\vendor\amphp\sync\src\PrefixedKeyedMutex.php on line 7