I can't play TT anymore

I tried making a MOD, and i went to the mis. file and then picked the TT1_1 file when i typed in the codes for the accel. deccel. and for the antislide, everything went ok, now keep in mind I did that right before OBJECTIVE END, So then i went to TT and i tried loading a game, then when the loading sign comes up ,right before you play any TT game, reached Lighting Mission. the loading just quit and there was this message about an error and so on. Well my point is i couldn't make a MOD and then later on when i tried to play a game online, just any regular game, i couldn't play, the same thing happend and when the loading sign got to loading objectives, it just stayed there and i couldn't play a game. Now i can't play creay or do anything on TT, i really hate to quit playing TT but i am afraid thats what i'll have to do, is there anyway anyone can help. If you can't its ok, i'll just remember TT as a good game i once was able to play, but if you can help could you tell me how to fix my problem.