C++ Problem

Hey /prog/

While playing around with classes and writing to files I ran into a problem, I'm trying to obtain an item from a file, which I do with this code


void load_backpack(character& theChar)
{
    backpack inventory = theChar.inventory_;
   
    list <item> potions = inventory.potions;
    list <item> armor = inventory.armor;
    list <item> weapons = inventory.weapons;
    
    ofstream item_file;
    item_file.open(ITEM_FILE, ios::in);
   
    while (item_file.good())
    {
        item theItem;
        item_file >> theItem;
       
        if (theItem.type() == "A") armor.push_front(theItem);
        if (theItem.type() == "W") weapons.push_front(theItem);
        if (theItem.type() == "P") potions.push_front(theItem);
    }
}


Whenever I try to compile I keep on getting the same error though, The compiler sais he cannot find a match for the opperator >>, he only mentions one possible candidate, which is the declaration of the >> operator in my class, this is how it is implemented


istream& operator>> (istream& is, item theItem)
{
    string contents, xdy, weight;
    getline(is, contents);
   
    theItem.type_ = (read_os_string(contents, true));
    theItem.name_ = (read_os_string(contents));
    theItem.description_ = (read_os_string(contents));
    weight = (read_os_string(contents));
    xdy = (read_os_string(contents));
    theItem.effect_ = (read_os_string(contents));
   
    theItem.weight_ = atoi(weight.c_str());
    theItem.xdy_ = xdy;
    theItem.xdice_ = atoi((xdy.substr(0, 1)).c_str());
    theItem.ydice_ = atoi((xdy.substr(2, 3)).c_str());
   
    return is;
}

That piece of code is a friend of the item class, so I really don't see what the problem is, anybody who could shed some light on this situation?