Fatal error: Uncaught Error: Interface "Amp\Sync\KeyedMutex" not found in C:\xampp\htdocs\londoncityroom\vendor\amphp\sync\src\LocalKeyedMutex.php:8
Stack trace:
#0 {main}
thrown in C:\xampp\htdocs\londoncityroom\vendor\amphp\sync\src\LocalKeyedMutex.php on line 8