error LNK2001

#include <stdio.h>
#include <windows.h>
#include <iostream.h>
#include "Ltc2x.h"
#include <stdlib.h>

int main(int argc, char* argv[])
{	



HANDLE idPort;
int insertada=-1,funciona=1,contador=0;

while(funciona == 1) {    
	idPort = C3OPEN ("USB");
	(int) insertada = C3INSERT(idPort,0,1000);
	if(insertada==0){
		//cout << "TI," << contador++;
		system("leerdni.exe");	
		insertada=-1;
	};//Fin el IF
	C3CLOSE (idPort);
};//Fin del While
C3CLOSE (idPort);
return 0;
}