Problems with exporters

I’ve got problems with the directx exporter.
I’ve been making a game with vb6 and the exported meshes appear with errors(like missing faces )or do not appear at all.
What is more wheb I export the my meshes in order to use them in caligari truespace, I can not set textures(in truespace),althouh i’ve se the material.

What can I do to fix this ?