south for django

hello,

I've downloaded and installed south successfully to manage changes
with my models.py file

I type the following command

python manage.py schemamigration myApp --auto

then, get the following message

You cannot use --auto on an app with no migrations. Try --initial.

So I do as stated, with the command: python manage.py schemamigration myApp --initial, but get the following message:

Cannot freeze field

what's wrong?

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