Нет подходящего конструктора по умолчанию

Я получаю сообщение об ошибке:

SZ_GameItem — нет подходящего конструктора по умолчанию.

Вот части кодов:

main.cpp:

#include <iostream>

#include "SDL.h"#include "SDL_image.h"#include "SDL_mixer.h"
using namespace std;

#include "SZ_timer.h"SZ_Timer aTimer;
const int DELTA_TIME = 10;
bool done = false;

#include "SZ_Player.h"SZ_Player examplePlayer;

#include "SZ_GameItem.h"SZ_GameItem exampleItem;

int main(int argc, char *argv[])
{
if (SDL_Init(SDL_INIT_EVERYTHING) < 0);

// Creates the game window
SDL_Window* game_window = SDL_CreateWindow("Rise", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);

// Creates the game render to draw on the game window.
SDL_Renderer* game_renderer = SDL_CreateRenderer(game_window, 0, 0);

// Game Loop
examplePlayer.Init();
while (!done)
{
aTimer.resetTicksTimer();

examplePlayer.Update();
examplePlayer.Input();

exampleItem.Update();

SDL_SetRenderDrawColor(game_renderer, 0, 0, 20, SDL_ALPHA_OPAQUE);
SDL_RenderClear(game_renderer);
examplePlayer.Render(game_renderer);
exampleItem.Render(game_renderer);
SDL_RenderPresent(game_renderer);

// If less time has passed than allocated block, wait difference
if (aTimer.getTicks() < DELTA_TIME)
{
SDL_Delay(DELTA_TIME - aTimer.getTicks());
}
}
SDL_Quit();

// Exits program
return 0;
}

SZ_GameItem.cpp:

#include "SZ_GameItem.h"
SZ_GameItem::SZ_GameItem(int eX, int eY, int eW, int eH)
{
x = eX;
y = eY;
height = eH;
width = eW;

rect.x = x;
rect.y = y;
rect.h = height;
rect.w = width;

velocity.x = 1;
velocity.y = 0;
}

SZ_GameItem::~SZ_GameItem()
{

}

void SZ_GameItem::Input()
{

}

void SZ_GameItem::Update()
{
rect.x = x;
rect.y = y;
rect.h = height;
rect.w = width;

x = x + velocity.x;
y = y + velocity.y;
}

void SZ_GameItem::Render(SDL_Renderer* pRenderer)
{
SDL_SetRenderDrawColor(pRenderer, 255, 255, 255, 255);
SDL_RenderDrawRect(pRenderer, &rect);
}

SZ_GameItem.h:

#ifndef aGameItem
#define aGameItem

#include <iostream>
#include "SDL.h"#include "SZ_Vector2D.h"
class SZ_GameItem
{
public:
SZ_GameItem(int x, int y, int w, int h);
~SZ_GameItem();

void Update();
void Input();
void Render(SDL_Renderer* aRenderer);

SZ_Vector2D velocity;
int x, y, height, width;

private:
SDL_Rect rect;
};

#endif

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