Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/OpenAudio_ArduinoLibrary/src/commit/2c66f6cdea21bb74579a0de7acfd42de682c2570/examples/SDWavPlayer
You should set ROOT_URL correctly, otherwise the web may not work correctly.