Help ? !

[Sasquach]

every time i do the simplest mod like raise the jump hight or make the MC run faster or switch a guns prodjectile, if try to go on the level it comes up with a message saying : ' Fatal Error ! some files are missing or corrupt we recomend reinstalling'

then i cant get on the level. The only way to then get on that level is to reinstall (it wont let me back into it even if i change everything back to normal)

It is this way with all levels multiplayer like blood glutch and mission levels like the maw

It has worked twice when i raised the junp hight and put it so that i climbed walls. there seems to be no partern it didn't work for about 5 tries then it worked then it didn't for about 8 then it worked then it didn't for about 3 and so on

can someone please help me ? is this normal ?

[(HJ)GruntNick]

this is the wrong forum but try making a backup off all your maps and then replace them when you get an error this should go in the tech and question forum i believe