Troubleshooting hg-flask with mongoengine...

__init__.py

from flask import Flask
from flask.ext.mongoengine import MongoEngine
from config import basedir
from flask.ext.login import LoginManager

app = Flask(__name__)
app.config.from_object('config')

db = MongoEngine(app)
lm = LoginManager()
lm.init_app(app)

from app import routes, models

config.py

import os

basedir = os.path.abspath(os.path.dirname(__file__))
DEBUG = True
CSRF_ENABLED = True
SECRET_KEY = 'SomethingSecret'
MONGODB_SETTINGS = { 'DB': "homelessgaffer" }

forms.py

class RegisterUser(Form):
    
    firstname = TextField("First name",  [validators.Required(
                            "Please enter your first name.")])
    lastname = TextField("Last name",  [validators.Required(
                            "Please enter your last name.")])
    email = TextField("Email",  [validators.Required(
                        "Please enter your email address."), 
                        validators.Email(
                        "Please engter a valid email address.")])
    password = PasswordField('Password', [validators.Required(
                                "Please enter a password.")])
    submit = SubmitField("Create account")
       
    def __init__(self, *args, **kwargs):
        Form.__init__(self, *args, **kwargs)
        
    def validate(self):
        if not Form.validate(self):
            return False

        try:
            user = User.objects.get(email=self.email.data.lower())
            self.email.errors.append("That email already exists.")
            return False
        except DoesNotExist:
            return True

models.py

class User(db.Document):

    #uid = db.IntField(primary_key = True)
    firstname = db.StringField(max_length=64)
    lastname = db.StringField(max_length=100)
    email = db.StringField(max_length=120, unique = True)
    pwdhash = db.StringField(max_length=54)

    def set_password(self, password):
        self.pwdhash = generate_password_hash(password)
        
    def check_password(self, password):
        return check_password_hash(self.pwdhash, password)

requirements.txt

Flask==0.9
Flask-Admin==1.0.6
Flask-Login==0.2.6
Flask-Script==0.6.2
Flask-WTF==0.8.3
Jinja2==2.6
MarkupSafe==0.18
Tempita==0.5.1
WTForms==1.0.3
Werkzeug==0.8.3
argparse==1.2.1
decorator==3.4.0
flask-mongoengine==0.7.0
itsdangerous==0.23
mongoengine==0.8.3
pymongo==2.5.2
uWSGI==1.9.14
wsgiref==0.1.2

routes.py

@app.route('/register', methods = ['GET', 'POST'])
def register():
    
    form = RegisterUser()
    
    if request.method == 'POST':
        if form.validate() == False:
            return render_template('register.html', form=form)
        else:
            newuser = User(firstname = form.firstname.data.title(),
                           lastname = form.lastname.data.title(),
                           email = form.email.data.lower(),
                           password = form.password.data)
            newuser.save()
            
            session['email'] = newuser.email
            
            return "[1] Create a new user [2] sign in the user [3] redirect to the user's profile"
   
    elif request.method == 'GET':
        return render_template('register.html', form=form)

Traceback

Traceback (most recent call last):
  File "/home/cldershem/Documents/Development/homelessgaffer.com/hg-Python/venv/lib/python2.7/site-packages/flask/app.py", line 1701, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/cldershem/Documents/Development/homelessgaffer.com/hg-Python/venv/lib/python2.7/site-packages/flask/app.py", line 1689, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/home/cldershem/Documents/Development/homelessgaffer.com/hg-Python/venv/lib/python2.7/site-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/cldershem/Documents/Development/homelessgaffer.com/hg-Python/venv/lib/python2.7/site-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/cldershem/Documents/Development/homelessgaffer.com/hg-Python/venv/lib/python2.7/site-packages/flask/app.py", line 1358, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/cldershem/Documents/Development/homelessgaffer.com/hg-Python/venv/lib/python2.7/site-packages/flask/app.py", line 1344, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/cldershem/Documents/Development/homelessgaffer.com/hg-Python/app/routes.py", line 91, in register
    password = form.password.data)
  File "/home/cldershem/Documents/Development/homelessgaffer.com/hg-Python/app/models.py", line 17, in __init__
    self.firstname = firstname.title()
  File "/home/cldershem/Documents/Development/homelessgaffer.com/hg-Python/venv/lib/python2.7/site-packages/mongoengine/base/document.py", line 145, in __setattr__
    super(BaseDocument, self).__setattr__(name, value)
  File "/home/cldershem/Documents/Development/homelessgaffer.com/hg-Python/venv/lib/python2.7/site-packages/mongoengine/base/fields.py", line 119, in __set__
    instance._data[self.name] = value
AttributeError: 'User' object has no attribute '_data'