第11行总是提示invalid syntax错误，实在是找不出哪错了，大家帮忙看看，谢谢了

def register_page(request):
if request.method == 'POST':
form = RegistrationForm(request.POST)
if form.is_valid():
user = User.objects.create_user(
username=form.clean_data['username'],
password=form.clean_data['password1'],
email=form.clean_data['email']
)
return HttpResponseRedirect('/accounts/register/success/')
else:
form = RegistrationForm()
variables = RequestContext(request, {'form': form})
return render_to_response ('registration/register.html',variables)