Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/parasiTstudio/BALibrary_parasitstudio/src/commit/7bf2ed6906de1019c268fe8d02176459a106d5b0/examples/Delay/SoundOnSoundDemo You should set ROOT_URL correctly, otherwise the web may not work correctly.