You'll need to find those enables that don't have characters in them; I did a little research, and you would have found this easily before going to a Help Topic, just search "Devbest how to add an enable" and it pops up.
Props go to Mythic
1 - Download the SWF and put the SWF in your PRODUCTION Directory
2 - Add the effect to your effectmap.xml (something like - <effect id="300" lib="Cuf" type="fx" "revision="60559"/> -) [Effectmap.xml should be in your gamedata directory)
3. Clear your cache and reload the emulator, and load the hotel and try the enable you added.
Original Topic Thread:
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On the same thread you do have people getting issues from this; my guess is that someone duplicated the number that belongs to another enable, so choose a number that's not chosen.