no. You need to learn the basics. Throwing symbols at bugs may work sometimes but it is a horrible, horrible, horrible, horrible way to code. Yes, all four "horribles" are needed. I strongly recommend that you purchase of "The C++ Programming Language" by Bjarne Stroustrup, the creator of C++. I also strongly recommend that you stop adapting example source code, as I suspect that is how you are teaching yourself.

Now let's pretend you didn't have the internet and were without the friendly people on gamedev. So now we'll do a basic lesson on problem solving. So you're given a compiler error that you can't figure out, but you are told what line it's on. You've got a pretty long statement there, so you can't figure out exactly what the compiler is complaining about. So one way to tackle it is to break the statement down to smaller parts and see which part the compiler doesn't like. In this case you might try:

std::string sub = Script.substr(Pos, GTAddress.length + 1);
if (sub == GTAddress + ":")

Now the compiler error migrates up the line. So try to break that down further.

int len = GTAddress.length + 1;
std::string sub = Script.substr(Pos, len);

Compiler error migrates up a line again. Now you'd probably see for yourself what the problem was.