Hey, i'm making a mod for Oblivion it is the Harry potter oblivion mod

Site : http://www.moddb.com/mods/harry-potter-oblivion-mod

and i have a Problem, when i import an wizard hood it says Could not find parent mode extra for...... and i don't know what's wrong,
so maybe if you guys know what the problem is.... please tell me :$

i'm sorry for my bad English

Thank you - Stef538