Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/8259addaf634f69f20eee7c5a9d65326fe486eda/third-party/TeensyVariablePlayback/examples You should set ROOT_URL correctly, otherwise the web may not work correctly.