DllMain failing ?

[NoName48]

Hey . I have problem with simple dll when i inject it with example cheat engine i got error "Failed to inject DLL " . I don't know why .

#include <Windows.h>


float SpeedPtr = (float)(0x0102DB38);
float fSpeedPtr = *(float*)SpeedPtr;


void WINAPI Hack()
{
   *(float*)(fSpeedPtr + 0xC2DB38) = 500;
}

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
	switch (fdwReason)
	{
	case DLL_PROCESS_ATTACH:
		Hack();//CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE)Hack, NULL, NULL, NULL);
		break;
	}

	return TRUE;
}