e: [mer-general] Cannot creator iamge for virtual machine

[superccxin]

Hi
the http://wiki.merproject.org/wiki/Image_Cre%20ation wiki says that the
following modules should be load:
      * squashfs
      * squashfs-tools
      * dm_snapshot
      * loop
I've installed all the components that the wiki suggests. but none of
them automatically loaded in my system!
how to install these modules and load them