🚀 go-pugleaf

I have this code:

 SC_HANDLE hService = ::OpenService(hSCM, szSvcName,
SERVICE_PAUSE_CONTINUE);

 PrintError(GetLastError());
 WaitForSingleObjectEx(oOverlap.hEvent, 1000, TRUE);
    if (hService == NULL)
    {
        return ret_code;
    }

//--------------------------------------------------------------------------
-
void __fastcall TServiceCommands::PrintError(unsigned long code)
{
     char *serr;

     if(::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
      FORMAT_MESSAGE_FROM_SYSTEM,
      NULL,
      code,
      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
      (LPTSTR)&serr,
      0,
      NULL) == 0)
  {
        Application->MessageBox("Unknown Error\n", "Service", MB_OK);
  }

PrintError formats the error message from GetLastError().  The problem is I
get this error message:

    "Overlapped I/O operation is in progress"

 after  PrintError(GetLastError) executes.  The code predeces normally but I
would like to stop this error from occurring.  What is this error?  How can
I get rid of it?

Thanks..