Another "Error: Unresolved symbol" Problem

Hey there,

I'm getting "unresolved Symbol ABC" error when building my project every time I'm calling the constructor of my own classes in my main method.

I've created a minimalistic example. Here's the code:

/*
 * TestClass.h
 *
 *  Created on: 19.01.2012
 *      Author: s.schindler
 */

#ifndef TESTCLASS_H_
#define TESTCLASS_H_

#include 

using namespace MAUtil;

class TestClass {
public:
	TestClass(int i, String str);
	virtual ~TestClass();

private:
	int i;
	String str;
};

#endif /* TESTCLASS_H_ */

/*
 * TestClass.cpp
 *
 *  Created on: 19.01.2012
 *      Author: s.schindler
 */

#include "TestClass.h"

TestClass::TestClass(int i, String str) : i(i), str(str) {}

#include "TestClass.h"

/**
 * Entry point of the program. The MAMain function
 * needs to be declared as extern "C".
 *
 *
 */
extern "C" int MAMain()
{
	TestClass *test = new TestClass(5,"Hello");
	return 0;
}

When building the project, I get this Error: "Error: Unresolved symbol '__ZTV10TestClass'" in TestClass.cpp at the line where I'm implementing the constructor.

You can see my build settings in the attachment.

 What am I doing wrong?

Thanks in advance!