I am trying to download MOD09GA and MYD09GA in a for loop. MOD09GA was downloaded successfully, but MYD09GA failed, why?

This is part of the code：

`for product in product_list:
  destSubFolder = os.path.join(destFolder, product + "/" + "HDF_file")
  modisDown = downmodis.downModis(destinationFolder=destSubFolder, tiles=tiles, today=day, delta=delta, user="xxx", password="xxx", product=product+product_version)
  modisDown.connect()
  modisDown.downloadsAllDay()