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Symptom

A model does not validate with the following message:

Validating models...
project.allication: Error when calling the metaclass bases
unbound method contribute_to_class() must be called with TextField instance as first argument (got ModelBase instance instead)
1 error found.

Possible Cause

A model field was not declared properly, the parentheses after the field types name were missing:

wrong:

class Content(models.Model):
content = models.TextField

correct:

class Content(models.Model):
content = models.TextField()

Solution

A model field is an instance of the appropriate Field class, so the parentheses are required.