There's a leak in my map - except, there isn't

[PROEM]

...Or at least I can't see it. I'm experimenting with GtkRadiant and I'm trying to create a map for trem, but when I try to compile it I get an error saying "MAP LEAKED." Unless I'm mistaken that's the message you get when the map is exposed to the void. Thing is, the entire map is basically just a big cube that I hollowed out with the "hollow" button, so I don't see how there could be any leaks.

I'm using GtkRadiant 1.5.0. Here's a link to the map:

http://www.2shared.com/file/7331417/17b1628c/map-box-alpha1-110.html

That's basically the entire pk3, but in zip form. The .map is in there but I thought it would be useful to include the stuff needed to compile it.

[CreatureofHell]

Because I couldn't be bothered to actually look at your map I just want to remind you to make sure that no entities are touching the void.

[Draeke]

Your map needs an info_player_intermission entity (this serves as the intermission viewpoint) somewhere inside the brush hull.
Compilable copy of your .map: Here

Check out http://tremmapping.pbworks.com/ for getting started in mapping.

[mooseberry]

Don't use hollow anyways.

[UniqPhoeniX]

Make the map hull from brushes that don't overlap. Don't use hollow.

[PROEM]

Your map needs an info_player_intermission entity (this serves as the intermission viewpoint) somewhere inside the brush hull.
Compilable copy of your .map: Here

Check out http://tremmapping.pbworks.com/ for getting started in mapping.

Ohh, I had a hunch it was because it was incomplete. Much thanks!