Do NOT add mods while making a scenario. If you are in the middle of making one, save it and then load it back up with new mods it will then require those mods that you do not need. Why is that a problem? Well suddenly my soldiers were no longer able to place bombs or mines once I added the IFA liberation ACE mod and could not fix the damn problem. I took the mod out and and then I couldn't load it at all. The soldiers could only fire the main weapon. I didn't even use any ACE stuff on it.

Now I begin the deleted scenario again.