Ensure that you have installed the patch 1.04 and the custom map folder is in the right directory (\Star Wars Empire at War\GameData\Data\CustomMaps) and that you have placed your maps there to.
If this not help you, try a clean install of the game, with out any mods in your game folder.
There is no emotion, there is peace.
There is no ignorance, there is knowledge.
There is no passion, there is serenity.
There is no death, there is the Force.