Fatal error: Uncaught Error: Interface "Psr\Cache\CacheItemPoolInterface" not found in C:\xampp\htdocs\londoncityroom\vendor\google\auth\src\Cache\MemoryCacheItemPool.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\londoncityroom\vendor\google\auth\src\Cache\MemoryCacheItemPool.php on line 26