getting this error. Please help me..

#include <MAUtil/Moblet.h>
#include <MAUI/Screen.h>
#include <MAUI/Label.h>
#include <conprint.h>
using namespace MAUtil;
using namespace MAUI;



class MyScreen : public Screen {
public:
	MyScreen() {

	}
	
	~MyScreen() {
		// todo: delete main widget of this screen 
	}
private:
};

class MAUIMoblet : public Moblet {
public:
	MAUIMoblet() {
		// initialize
		screen = new MyScreen();
		screen->show();
	}

	void keyPressEvent(int keyCode, int nativeCode) {
		// todo: handle key presses
	}

	void keyReleaseEvent(int keyCode, int nativeCode) {
		// todo: handle key releases
	}
	MyScreen* screen;

	~MAUIMoblet() {
		delete screen;
	}
	
};

typedef struct
{
	char *name;
	char *popn;
}City;

extern "C" int MAMain() {
	Moblet::run(new MAUIMoblet());

	City ny,la,ch,*ptr;
					ny.name = "New York City";
					ny.popn = "8,888,888";
					printf("\n%s,Population:%s\n",ny.name,ny.popn);

					ptr = &la;
					ptr->name = "Los Angeles";
					ptr->popn = "3,333,333";
					printf("\n%s,Population:%s\n",la.name,la.popn);

					ptr = &ch;
					ptr->name = "Chicago";
					ptr->popn = "1,111,111";
					printf("\n%s,Population:%s\n",ptr->name,ptr->popn);

					return 0;
					};

I keep getting this error message. Symbol '_MAMain' is already defined