Missing Package??

Using UEd 2 to create simple map.
Imported some texs, saved as package sahara.utx, but given them no group name.
Everything looks fine in editor, I try to play map in dx and it says failed to find package sahara.sky??
Any ideas, please?? :-S
Imported some texs, saved as package sahara.utx, but given them no group name.
Everything looks fine in editor, I try to play map in dx and it says failed to find package sahara.sky??
Any ideas, please?? :-S