about south

[laofahai]

when I try to make migration use: manage.py schemamition app_name --auto
and got the error like :

 ! Cannot freeze field 'app_name.model.field'
 ! (this field has class django_markdown.models.MarkdownField)

 ! South cannot introspect some fields; this is probably because they are custom
 ! fields. If they worked in 0.6 or below, this is because we have removed the
 ! models parser (it often broke things).
 ! To fix this, read http://south.aeracode.org/wiki/MyFieldsDontWork

but I can't understand the solution which the link give.

wish help. Thanks. :)

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