Error activating XKB configuration.
There can be various reasons for that.

If you report this situation as a bug, include the results of
 • xprop -root | grep XKB
 • gsettings get org.gnome.libgnomekbd.keyboard model
 • gsettings get org.gnome.libgnomekbd.keyboard layouts
 • gsettings get org.gnome.libgnomekbd.keyboard options