DllCall - "function" not found in the DLL file

#Region ;**** Directives created by AutoIt3Wrapper_GUI ****
#AutoIt3Wrapper_UseX64=y
#EndRegion ;**** Directives created by AutoIt3Wrapper_GUI ****
DllCall("pyclip.dll","int:cdecl","SomeFunction","str","abc")
MsgBox(0,"",@error)

// dllmain.cpp : Defines the entry point for the DLL application.
#include "stdafx.h"

#define DLL_EXPORT __declspec(dllexport)

int DLL_EXPORT SomeFunction(const LPCSTR sometext)
{
	MessageBoxA(0, sometext, "DLL Message", MB_OK | MB_ICONINFORMATION);
	return 0;
}

BOOL APIENTRY DllMain( HMODULE hModule,
					 DWORD ul_reason_for_call,
					 LPVOID lpReserved
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}