Cannot assign must be a instance. Django

Ive been trying to create a django project that has users and those users can add titles of books they have created. But each time I enter a book title (not on the admin page) I get this error ``` Cannot assign "u'Hello Wold'": "Scripter.title" must be a "Book" instance. ``` models.py ``` from django.db import models from django.contrib.auth.models import User class Book(models.Model): script_title = models.CharField(max_length=100) def __unicode__(self): return self.script_title class Scripter(models.Model): user = models.OneToOneField(User) name = models.CharField(max_length=30) title = models.ForeignKey(Book, null=True, blank=True, default=None) def __unicode__(self): return self.name ``` forms.py ``` from django import forms from django.contrib.auth.models import User from django.forms import ModelForm from scripters.models import Scripter#, Book class RegistrationForm(ModelForm): username = forms.CharField(label=(u'User Name')) email = forms.EmailField(label=(u'Email Address')) password = forms.CharField(label=(u'Password'), widget=forms.PasswordInput(render_value=False)) password1 = forms.CharField(label=(u'Verify Password'), widget=forms.PasswordInput(render_value=False)) class Meta: model = Scripter exclude = ('user','title') def clean_username(self): username = self.cleaned_data['username'] try: User.objects.get(username=username) except User.DoesNotExist: return username raise forms.ValidationError("User Name has been taken!") def clean(self): if self.cleaned_data['password'] != self.cleaned_data['password1']: raise forms.ValidationError("The passwords did not match") else: return self.cleaned_data class LoginForm(forms.Form): username = forms.CharField(label=(u'Username')) password = forms.CharField(label=(u'Password'), widget=forms.PasswordInput(render_value=False)) class CreateScript(ModelForm): title = forms.CharField(label=(u'Script Title')) class Meta: model = Scripter exclude = ('user','name',) def clean_title(self): title = self.cleaned_data['title'] return title ``` views.py ``` from django.http import HttpResponseRedirect from django.contrib.auth.models import User from django.contrib.auth.decorators import login_required from django.shortcuts import render_to_response from django.template import RequestContext from scripters.forms import RegistrationForm, LoginForm, CreateScript from scripters.models import Scripter, Book from django.contrib.auth import authenticate, login, logout def ScripterRegistration(request): if request.user.is_authenticated(): return HttpResponseRedirect('/profile/') if request.method =='POST': form = RegistrationForm(request.POST) if form.is_valid(): user = User.objects.create_user(username=form.cleaned_data['username'], email = form.cleaned_data['email'], password = form.cleaned_data['password'] ) user.save() scripter = Scripter(user=user, name=form.cleaned_data['name']) scripter.save() return HttpResponseRedirect('/profile/') else: return render_to_response('index.html', {'form': form}, context_instance=RequestContext(request)) else: form = RegistrationForm() context = {'form': form} return render_to_response('index.html', context, context_instance=RequestContext(request)) @login_required def Profile(request): if not request.user.is_authenticated(): return HttpResponseRedirect('/login/') Scripter = request.user.get_profile() context = {'Scripter': Scripter, 'Book': Book} return render_to_response('profile.html', context, context_instance=RequestContext(request)) def LoginRequest(request): if request.user.is_authenticated(): return HttpResponseRedirect('/profile/') if request.method == 'POST': submit = LoginForm(request.POST) if submit.is_valid(): username = submit.cleaned_data['username'] password = submit.cleaned_data['password'] scripter = authenticate(username=username, password=password) if scripter is not None: login(request, scripter) return HttpResponseRedirect('/profile/') else: return HttpResponseRedirect('/login/') else: submit = LoginForm() context = {'submit': submit} return render_to_response('login.html',context, context_instance=RequestContext(request)) def LogoutRequest(request): logout(request) return HttpResponseRedirect('/login/') @login_required def NewScript(request): if not request.user.is_authenticated(): return HttpResponseRedirect('/login/') if request.method =='POST': title_form = CreateScript(request.POST) if title_form.is_valid(): new_script = Book.objects.get_or_create( script_title = title_form.cleaned_data['title'] ) new_script.save() script = Book(script_title=title_form.cleaned_data['title']) script.save() return HttpResponseRedirect('/edit/') else: return render_to_response('NewScript.html', {'title_form': title_form}, context_instance=RequestContext(request)) else: title_form = CreateScript() context = {'title_form': title_form} return render_to_response('NewScript.html', context, context_instance=RequestContext(request)) ```