[HELP] What's wrong here?

#define CLIENT_DLL
#include <stdio.h>
#include <Windows.h>
#include "interface.h"
#include "cdll_int.h"
#include "eiface.h"
#include "tier0/memdbgon.h"

using namespace std;

IVEngineClient *enginecl;

BOOL APIENTRY DllMain(HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)
{
    while (!GetModuleHandle("client.dll") || !GetModuleHandle("engine.dll"))
    {
        Sleep(1000);
    }

    CreateInterfaceFn pEngineDLL = (CreateInterfaceFn)GetProcAddress(GetModuleHandle("engine.dll"), "CreateInterface");

    enginecl = (IVEngineClient *)pEngineDLL(VENGINE_CLIENT_INTERFACE_VERSION, NULL);

    enginecl -> ExecuteClientCmd("echo Injected!");

    return true;
}