It doesn't look like its textured, all the exporters I've used wont export untextured models (even if its only one face).

the first six words made me laugh :)

I thought you were Ptowery?

Anyway, make sure the model has a materials library assigned to it, currently, it doesn't look like it has one at all due to it being entirely pink...

Link it to a root node, by rigging it and then linking all nodes to a central one.

nvm.
Are you sure you're not trying to compile it from the "models" folder iinstead of the folder containing the "models" ? or did you put that model foler ?
Edited by bourrin33 on Mar 14, 2013 at 08:57 AM

Halo wouldn't compile it anyways. You've got too many bones. You should remove the facial bones and the finger bones, then rerig the face to what the default halo ce marines have.
Edited by XlzQwerty1 on Mar 14, 2013 at 10:40 AM

If it says "There are too many actors" it means that your mesh is linked with more than one bone. Just be sure that your model is linked to the "bip01 pelvis" bone. If this doesn't work, probably your rig is messed up, and there are two root nodes. Try to move your bones one by one, and see if some bone moves others that shouldn't be linked to, than re-link the bone to the right one. If neither this works, delete all your bones, import a new boneset and re-rig the model.
Edited by SOI_7 on Mar 15, 2013 at 04:31 PM