Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroMDAEPiano/src/commit/94067f20c95e67cf297ddca0d904e34d265ec30a/third-party/LiquidMenu/examples/E_progmem_menu You should set ROOT_URL correctly, otherwise the web may not work correctly.