error c2011 ?

[Altermisia]

error C2011: 'Item' : 'class' type redefinition
well... i don't know how to explained this...this error just come out of nowhere, or i can''t find it...and i not really know what it's mean...
this Item class are base class for 3 sub class, and it was no problem before i add in the sub class.
here are the code of the Item class .

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;

class Item{
private:
	int i_num;
	string i_des;
	double i_price;
	int i_quan;
public:
Item(){
	i_num = 0;
	i_des="";
	i_price=0.0;
	i_quan=0;
}
Item(int I_num, string I_des, double I_price, int I_quan){
	i_num=I_num;
	i_des=I_des;
	i_price=I_price;
	i_quan=I_quan;
}
//get accestor
int getNum(){return i_num;}
string getDes(){return i_des;}
double getPrice(){return i_price;}
int getQuan(){return i_quan;}

//set accestor
void setNum(int Num){i_num = Num;}
void setDes(string Des){i_des = Des;}
void setPrice(double Price){i_price = Price;}
void setQuan(int Quan){i_quan = Quan;}
};

thankyou for everone that trying to help me...

[mrnutty]

Somewhere you have declared a Item variable in your code.
maybe something like this : int Item;