Canderis

Mmm... Odd...

A second thought came up. Did you use another sort of material on one of your meshes. "Arch Design" is not the standard material 3Ds Max uses.

I know the export script doesn't like the other materails. I know this because for certain renders I tweaked material to emit a nice glowly light. I once forgot to change it back and I got all sorts of bugs.

I'dd check that out. I think it might be something within a Multimaterial on slot 19 that causes this error.