硬盘安装的RedHat9.0怎么装升级包？

ssben

我把iso文件用mount *.iso /mnt/VCD -o loop挂接在该目录下
然后用redhat-config-packages --isodir=/mnt/VCD
提示：
Traceback (most recent call last):
  File "/usr/share/redhat-config-packages/MainWindow.py", line 160, in ?
    im = get_method(args)
  File "/usr/share/redhat-config-packages/config.py", line 53, in get_method
    return method.LoopbackIsoInstallMethod(isodir)
  File "/usr/share/redhat-config-packages/method.py", line 332, in __init__
    self.mountDisc(1)
  File "/usr/share/redhat-config-packages/method.py", line 382, in mountDisc
    self.tree + "/" + self.discImages[discNum],
KeyError: 1
不知何解，请教~