Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/music-synthesizer-for-android/commits/commit/6feebefea959a6cffc834f8b10f20b0a168d0707/android/res/drawable-hdpi/open_eye.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.