If this is a map, it could mean a problem with the lighting, texturing, geometry, or layout; try the Cube Wiki for tips on using the engine. Should it be some other form of content, then it may need to be elaborated upon to be worth something.
The layout of a map is among the most important parts of a winning design, try making sure exotic geometry is removed or clipped and the level is open and free of dead-ends or unexplained phenomena.
Refer to the Packaging Guide for information on how to fix this.
A small, symmetrical map suited for duel, 2v2, or FFA.
[Update] 1.1 - Small geometry and clip fixes
[Update] 1.2 - Lessened the intensity of the white lighting in the map, reduced the radii of several of the green light ents, texture fix
[Update] 1.3 - Changed the stair light ents to the same RGB as the lights under the center arches, added additional white light ents in the banner rooms, replaced the yellow lights at each end of the map with white lights. Attempted to reduce the light "salad effect."
Video: http://www.youtube.com/watch?v=b9MoD5tbJMg
All feedback is greatly appreciated.