The new version of arghrad crashes, but I tried with an old version (2.00), and it compiles. If fixing the brush alignments in the map doesn't fix the crash, you can use the old version (attached) to light it. I also attached a lit version of the map.
Another thing I just noticed - if you stand in the water and look to the sides, you can see through the ground in the high path. You should never use sky brushes to cover other areas of map, as you can simply see through them.