Evening all.
I seem to come across a bug. I can export as FBX, but it fails to do so with LW exporter.
I've attached my .blend, as well as a screenshot of the error.
I've looked for the usual suspects, inverted normals, overlapping UV, duplicate vertex, apply scale, rotation extra objects, etc. I don' think it's my file, but I might be wrong.
Anyways, thanks for looking into it, this is a brilliant application and I enjoy very much using it.
.blend here.
https://drive.google.com/file/d/0B4_osSxp3TcVSHNiRHE0Q1hwZzQ/view?usp=sharing
Using Windows 8.1 64 bit, produced error with blender, 2.73a, and 2.72b.