Created attachment 329806 [details] build log As always in the beta series, marble build is broken in the python bindings...
I've sent a mail to the bindings maintainer to have them updated for the API changes. My knowledge about python bindings is too limited to do more than trivial fixes unfortunately.
https://projects.kde.org/projects/kde/kdeedu/marble/repository/revisions/0a06f71501a5ce9ad0795f794f3d7b875e0eea23 should fix it.
This bug is waaay obsolete.