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/src/commit/766b572a6426d0109294c1f3fd32302608ed6ed5/j2se/.externalToolBuilders
You should set ROOT_URL correctly, otherwise the web may not work correctly.
Bryan Klimt