C/C++ :: Getting Undefined Reference Error To A Function

I'm getting an undefined reference error to a function, and I can't figure out why. I have tried letting code blocks compile the files, I have tried the command line to compile it with the same results.

I looked up the error and found this from [URL]

undefined reference
Example
/tmp/cc2Q0kRa.o: In function `main':
/tmp/cc2Q0kRa.o(.text+0x18): undefined reference to `Print(int)'
collect2: ld returned 1 exit status

Meaning / Your code called the function Print, but the linker could not find the code for it in any .o file

Usual Causes

You forgot to link the .o file that contains the function

You misspelled the name of the function

You spelled the name of the function correctly, but the parameter list is different in someway

which seems to be the error I get. I have double checked all 4 and I see nothing.

The code that specifically gives me the error is:

Item *name = new Item(desc, id, weight, loc);
itemMap.addItem(name);

and the class looks like this:

class Item // Standard Items {
private:
std::string name;
std::string desc;
int id;
int weight;
int loc;

[code].....

I think everything matches up unless I'm just missing it.

Full codes are located here: [URL]

what I'm doing wrong?