Map is pitch black in game

[cassiuscrusades]

Hi,

I have been messing around with the HPL3 editor that comes with SOMA for a few hours now. I finally managed to make a couple of rooms and get it running in the gamedev.bat, but when I load in to any of my maps they are pitch black. I can hear the sounds that I add in, and can hear my character walking around but cannot see anything at all. I have tried adding lights to the level, but this appears to do nothing to help. Apologies as I have extremely limited experience with this kind of thing (some basic level modding in the TES Creation Kit) so I am probably doing something extremely stupid. Thanks in advance.