just some more thoughts on this. This error usually occurs when e.g. diodon has be built from source before and it has been cleaned up but some compiled schema files are still around (as this compiled schema files contains other details of other schema as well so it would be criticla to remove it when uninstall from source).
So just check whether there is a file in /usr/local/share/glib-2.0/schemas/gschemas.compiled and if yes delete it.
just some more thoughts on this. This error usually occurs when e.g. diodon has be built from source before and it has been cleaned up but some compiled schema files are still around (as this compiled schema files contains other details of other schema as well so it would be criticla to remove it when uninstall from source).
So just check whether there is a file in /usr/local/ share/glib- 2.0/schemas/ gschemas. compiled and if yes delete it.
Does this work for you?