Confirm email by matching on form

I have a form with an email field and email confirmation field. I
want to check the form input to make sure the two fields match. So
far I can get the error message 'Email addresses do not match.' to
display, but if they do match I am getting an error 'InterfaceError
at /order/
Error binding parameter 5 - probably unsupported type' Here is my
code:

#models
from django.db import models
from django import forms
from django.forms import ModelForm

class Customer(models.Model):
date_stamp = models.DateTimeField(auto_now_add=True)
order_number = models.PositiveIntegerField(editable=False)
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=40)
email = models.EmailField()
email_conf = models.EmailField(verbose_name='Confirm Email')
year_built = models.PositiveIntegerField()
period = models.PositiveIntegerField(editable=False)
direction = models.CharField(max_length=20,
choices=direction_choices)
floor_plan = models.CharField(max_length=2,
choices=floor_plan_choices)

def __unicode__(self):
return u'%s %s' % (self.first_name, self.last_name)

class CustomerForm(ModelForm):

class Meta:
model = Customer

def clean_year_built(self):
year = self.cleaned_data['year_built']
if year < 1800:
raise forms.ValidationError("Please enter a year between 1800 and
2020.")
if year > 2020:
raise forms.ValidationError("Please enter a year between 1800 and
2020.")
return year

def clean_email_conf(self):
cleaned_data = self.cleaned_data
email = cleaned_data.get("email")
email_conf = cleaned_data.get("email_conf")
if email and email_conf:
if email != email_conf:
raise forms.ValidationError("Email addresses do not match.")
return cleaned_data
#views
from django.shortcuts import render_to_response
from django.http import HttpResponseRedirect
from newsite.order.models import Customer, CustomerForm

def order(request):
if request.method == 'POST':
form = CustomerForm(request.POST)
if form.is_valid():
form.save()

return HttpResponseRedirect('/order_complete/')
else:
form = CustomerForm()

return render_to_response('order.html', {'form': form})

def order_complete(request):
return render_to_response('order_complete.html')

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