Dear all,
maybe some of you get the error message while starting the Appimage ./APM-Planner_2-2.0.30-rc3-x86_64.AppImage as me on Opensuse Leap 15.x:
./APM-Planner_2-2.0.30-rc3-x86_64.AppImage: symbol lookup error: /usr/lib64/libgio-2.0.so.0: undefined symbol: g_module_open_full
The reason is that libgio-2.0.so.0 is included in the appimage and maybe installed on the system. The solution is to remove libgio-2.0.so.0 from the appimage with the following steps in command-line and repackage the appimage:
./APM-Planner_2-2.0.30-rc3-x86_64.AppImage --appimage-extract
rm -f squashfs-root/usr/lib/libgmodule-2.0.so.0
wget https://github.com/AppImage/AppImageKit/releases/download/13/appimagetool-x86_64.AppImage
chmod u+x *.AppImage
./appimagetool-x86_64.AppImage squashfs-root APM-Planner_2-2.0.30-rc3-x86_64.AppImage
Success!