Fatal error: Uncaught Error: Buffer callback returned a string, but also emitted output to the buffer in /app/src/Utils.php:37 Stack trace: #0 /app/src/Controllers/About/Misc/CreditsController.php(29): phpweb\Utils::bufferOutput(Object(Closure)) #1 /app/public/index.php(87): phpweb\Controllers\About\Misc\CreditsController->__invoke(Object(Symfony\Component\HttpFoundation\Request)) #2 /app/public/index.php(115): {closure:/app/public/index.php:15}() #3 {main} thrown in /app/src/Utils.php on line 37