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Don't ask becouse I don't know.

I got this in my warnings.txt

NiBone "Bip01 Tail" not found!
NiBone problem with Chest for "Cello_Fem_Player_Chest_BP".
View warnings.txt for bone problems.

Could some one explane to me what I need to do to fix it.

You probably have the mod Arktwend running?

Look for the latest version, you could find hints in e.g. http://morrowind2009.wordpress.com/tota ... d-english/

There are most probably ways to overcome the issues, not necessarily meaning that everything starts working, though. Language may also be a problem.