ValueError: Related model 'cms.Placeholder' cannot be resolved

I changed a field from TextField to PlaceholderField (from Django-CMS) and now I get the above error when running 'migrate'.

I can't find a way to fix this, nor can I undo it as there appears to be no way to remove migrations.

I am using:

  Python 3.4.3

  Django 1.8.5

  Django-CMS 3.1.3

Does anyone have any ideas?

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