DirectX Error

[jwkNwA7f]

I am learning DirectX. I have just finished my first application, but I have ran into a problem.

I am not sure if this is enough info (if it isn't ask me what you need to know):
It does compile in VS 2013, but when I call showBackBuffer():

HRESULT Graphics::showBackBuffer() 
{
	result = E_FAIL;
	device3d->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 255, 0), 1.0f, 0);
	device3d->BeginScene();
	device3d->EndScene();
	result = device3d->Present(NULL, NULL, NULL, NULL);
	return result;
}

It says this:

Unhandled exception at 0x011719C6 in Game.exe: 0xC0000005: Access violation reading location 0x00000000.

I am not sure what to do.
Thanks for your help!

EDIT: FIXED IT