Hast du das CS mit der OBSE-Erweiterung gestartet?
Zitat Zitat von OBSE Readme.txt
Scripts written with these new commands must be written via the TESConstructionSet launched with obse_loader. Open a command prompt window, navigate to your oblivion install folder, and type "obse_loader -editor". The normal editor can open plugins with these extended scripts fine, it just can't recompile them and will give errors if you try.