Well there are certain files that should get skipped because PyFFI has problems with them. Look in the PyFFI thread, in the OP there is an excellent skip list. Place that list in /utilities/toaster. Place your meshes in the "in" folder and run PyFFI by right-clicking on "oblivion_optimize.ini".
Thanks for reply!
By the way, where can I find the PyFFI thread?
Would you tell me the link? Thanks again.