Issue with Modelform

This is what I got after coding my ModelForm What could have caused that, I kept trying to debug it, but everything seems right, didn’t know where the errors are coming from This was the error I got after running the server, the first form worked out, as I was trying to redirect to another form, this error threw up

raise ValueError ("ModelForm has no model class specified.") ValueError: ModelForm has no model class specified. modelform structure[][1\completemodelform structure]

I want it to work, I’m actually trying to build a web marketplace with Django, the only issue I go was the modelForm error and it really makes me worried

class RealBuyerForm(forms.ModelForm):
    class Meta:
        model = BuyerProfile
        exclude = ['user']

class SellerForm(forms.ModelForm):
    class Meta:
        model = SellerProfile
        exclude = ['user']