"adress_form_lines" you need to follow it to where you get the data from then follow that to wherever the model is, maybe it's instanced somewhere inside the model like
class Model(models.Model): ... def __str__(self): return self.company_name anyway likely it's noted where in the code it crashed later on down the line of the error -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to firstname.lastname@example.org. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/b1d7a083-12b5-4682-804e-baf12feb17a3%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.