Fatal error: Uncaught Error: Interface "Amp\ByteStream\OutputStream" not found in C:\01_Projekte\liga_24\phpseclib\vendor\amphp\byte-stream\lib\OutputBuffer.php:9 Stack trace: #0 {main} thrown in C:\01_Projekte\liga_24\phpseclib\vendor\amphp\byte-stream\lib\OutputBuffer.php on line 9