I keep getting this type of error: "attemp to call global "SCTGlobalParser_ParseMessage' (a nil value)"
You have installed SCT while in game. Please exit WoW completely, install SCT again, then start WoW again and you should be set.

I keep getting this type of error: "attempt to perform arithmetic on a nil value" OR "attempt to index local 'sColor' (a nil value)"
Please try reseting your SCT options by using the Reset button on the option page or by typing /sctreset