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/f4e3d097fe63c111dff58bd26b42b8fe40dc870d/android/res/drawable-hdpi/drums.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.