that
might be the problem - ORN needs obse, as far as I know. (and I
think NE needs it too?)
do you have it installed?
but it's possible that the launcher already uses obse -
could you check that?
in the Nehrim Launcher under
Einstellungen -> Extras
"OBSE bei Spielstart mitladen"
and you seem to have the Oblivion.esm in your data folder?
I don't :/
maybe there's something else wrong with your main installation
are there any other issues, beside that mod not working correctly?