'unicode' object has no attribute data

[kuyucakli]

I am using Django 1.5, with postgresql 1.9.4 db... when i try to add cropField to my model and migrate with south it gives 'unicode' object has no attribute data error. I have found the line that is causing the error --->

def get_db_prep_value(self, value, **kwargs):
        return self.json_field.get_db_prep_value(value.data, **kwargs)

When i change value.data to value south migrates. But this time when i try to edit my model on admin it gives 'unicode' object has no attribute 'iteritems' error from that line --->

 for name in value.iteritems(): ...
            name = self.validate_name(name)
            if hasattr(self, name):
                continue

Am i doing smt wrong?

[flashingpumpkin]

Could you please post the full traceback? Thanks