Why do you try to change the type of the map to time attack? I don't think that is the Time Attack you are thinking of. That mode probably needs some special needs that your map don't satisfy.
For a map to be played in Time Attack on a server it doesn't need to have a mod, just leave it as it is.
If you are trying something more comlicated then it is beyond me
Developper for The next generation, Clean and Powerfull controller eXpansion for your SM & TM server . Working on eXpansion² with full MP4 support and many other awesome features...