Fatal error: Uncaught Error: Interface "Psr\Http\Message\ServerRequestFactoryInterface" not found in /Users/ppss/Sites/PPSS/api/vendor/slim/http/src/Factory/DecoratedServerRequestFactory.php:18 Stack trace: #0 {main} thrown in /Users/ppss/Sites/PPSS/api/vendor/slim/http/src/Factory/DecoratedServerRequestFactory.php on line 18