Get Error code when using SetEvent() in multithread

#include <stdio.h>
#include <windows.h>
#include <process.h> 
#include <mmsystem.h>
#include <fstream>
#include <iostream>

#define EVENT_NUM 2

HANDLE ghEvents[EVENT_NUM];
DWORD WINAPI ThreadRunAtCoreX( int arg );

int main()
{
	HANDLE hThread; 
    DWORD i, dwEvent, ThreadIDCore1, ThreadIDCore2, ThreadIDCore3, ThreadIDCore4; 
	for (i = 0; i < EVENT_NUM; i++) 
    { 
        ghEvents[i] = CreateEvent(	NULL,   // default security attributes
					TRUE,  // auto-reset event object
					FALSE,  // initial state is nonsignaled
					NULL);  
        if (ghEvents[i] == NULL) 
        { 
            printf("CreateEvent error: %d\n", GetLastError() ); 
            ExitProcess(0); 
        } 
		else
		{
			printf("Create ghEvents[%d] successed\n",i);
		}
    }

	// Create a thread
    hThread = CreateThread( 
                 NULL,         // default security attributes
                 0,            // default stack size
                 (LPTHREAD_START_ROUTINE) ThreadRunAtCoreX, 
                 (LPVOID)0,         // thread function arguments                
                 0,            // default creation flags
                 &ThreadIDCore1); // receive thread identifier
    if( hThread == NULL )
    {
        printf("CreateThread error: %d\n", GetLastError());
        return 1;
    }
	// Create a thread
    hThread = CreateThread( 
                 NULL,         // default security attributes
                 0,            // default stack size
                 (LPTHREAD_START_ROUTINE) ThreadRunAtCoreX, 
                 (LPVOID)1,         // thread function arguments declare as Core code
                 0,            // default creation flags
                 &ThreadIDCore2); // receive thread identifier
    if( hThread == NULL )
    {
        printf("CreateThread error: %d\n", GetLastError());
        return 1;
    }

	dwEvent = WaitForMultipleObjects( 
        EVENT_NUM,           // number of objects in array
        ghEvents,     // array of objects
        FALSE,       // wait for any object
        INFINITE);       // INFINITE wait

    // Close event handles
    for (i = 0; i < EVENT_NUM; i++) 
        CloseHandle(ghEvents[i]); 

	printf("All thread finish\n");
	getchar();	
	return 0;
}

DWORD WINAPI ThreadRunAtCoreX( int arg )
{
	for(int i =0;i<10;i++)
	printf("Argument : %d\n",arg);

    if ( !SetEvent(ghEvents[arg]) ) 
    {
        printf("SetEvent failed (%d) | arg : %d\n", GetLastError(),arg);
        return 1;
    }
	else{
		printf("SetEvent Success arg = %d\n", arg);
	}
    return 0;
}