[Django] BSModalReadView 404 Error

class SmsrelatedCheckView(BSModalReadView):

template_name = 'homepage/read_smsrelated.html'

model = Smsrelated

404 에러발생

class SmsrelatedCheckView(BSModalReadView):

template_name = 'homepage/read_smsrelated.html'

model = Smsrelated

queryset = Content.objects.all()

queryset 등록 시 에러나지 않음