Exporting animation bug (Modifier Stack error)

I had a bad time trying to export my biped character using oFusion. It exported everything fine without animation, but when I checked the export animation, an error occurs: Unhandeled exception, please report.
Later, I changed the order of the modifier stack. Its order was:
Optimize Mesh
Skin
Edit Mesh
I moved the optimize mesh down below the skin modifier, and it worked fine.
I dont know if this is a general error if anything is above skin? or is it only Optimize?

As a rule, you should never have any modifiers that affect the mesh geometry or any of its channels above the animation modifiers

And collapse the stack where applicable