Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/AutoConnect/src/commit/062779b5e8ba988f7bb6d2992e329263842383f7/mkdocs/images/ac_auxjoin_multi.svg
You should set ROOT_URL correctly, otherwise the web may not work correctly.
