Am getting a 'Validate message for 0 tacos' error. How do I solve this?

from flask import Flask, redirect, url_for, flash, render_template, g
from flask.ext.bcrypt import check_password_hash
from flask.ext.login import LoginManager, login_required, login_user, logout_user, current_user

import forms, models

app = Flask(__name__)
app.secret_key = "asjkeifm77825fhfh;'-.8ll2-"

login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = "login"

@app.before_request
def before_request():
    g.db = models.DATABASE
    g.db.connect()
    g.user = current_user

@app.after_request
def after_request(response):
    g.db.close()
    return response

@login_manager.user_loader
def load_user(userid):
    try:
        return models.User.get(models.User.id == userid)
    except models.DoesNotExist:
        return None

@app.route("/register", methods=("GET", "POST"))
def register():
    form = forms.SignUpForm()
    if form.validate_on_submit():

        models.User.create_user(form.email.data, form.password.data)
        return redirect(url_for("index"))

    return render_template("register.html", form=form)

@app.route("/login", methods=("GET", "POST"))
def login():
    form = forms.LoginForm()
    if form.validate_on_submit():
        try:
            user = models.User.get(models.User.email == form.email.data)
        except models.DoesNotExist:
            flash("Email or Password Invalid", "error")
        else:
            if check_password_hash(user.password, form.password.data):
                login_user(user)
                flash("You're successfully logged in", "success")
                return redirect(url_for("index"))
            else:
                flash("Email or Password invalid", "error")

    return render_template("login.html", form=form)

@app.route("/logout")
@login_required
def logout():
    logout_user()
    return redirect(url_for("index"))

@app.route("/taco", methods=("GET", "POST"))
@login_required
def taco():
    form = forms.TacoForm()
    if form.validate_on_submit():
        models.Taco.create(
            protein=form.protein.data,
            shell=form.shell.data,
            cheese=form.cheese.data,
            extras=form.extras.data,
            user=current_user._get_current_object()

        )
        return redirect(url_for("index"))

    return render_template("taco.html", form=form)

@app.route("/")
def index():
    return render_template("index.html", tacos=models.Taco.select())


if __name__ == "__main__":
    models.initialize()

from flask.ext.login import UserMixin
from flask.ext.bcrypt import generate_password_hash, check_password_hash
from peewee import *


DATABASE = SqliteDatabase("tacos.db")


class User(UserMixin, Model):
    email = CharField(unique=True)
    password = CharField()

    @classmethod
    def create_user(cls, email, password):
        try:
            cls.create(
                email=email,
                password=generate_password_hash(password))

        except IntegrityError:
            raise ValueError

    class Meta:
        database = DATABASE


class Taco(Model):
    protein = CharField()
    shell = CharField()
    cheese = BooleanField()
    extras = TextField()
    user = ForeignKeyField(User)

    class Meta:
        database = DATABASE

def initialize():
    DATABASE.connect()
    DATABASE.create_tables([User, Taco], safe=True)

from flask_wtf import Form
from wtforms import StringField, PasswordField, TextAreaField, BooleanField
from wtforms.validators import DataRequired, Email, EqualTo


class SignUpForm(Form):
    email = StringField("Email",
                        validators=[
                            DataRequired(),
                            Email()])
    password = PasswordField("Password",
                             validators=[
                                 DataRequired(),
                                 EqualTo("password")])
    password2 = PasswordField("Confirm Password",
                              validators=[
                                  DataRequired()])

class LoginForm(Form):
    email = StringField("Email",
                        validators=[
                            DataRequired(),
                            Email()])
    password = PasswordField("Password",
                             validators=[
                                 DataRequired(),
                                 EqualTo("password")])

class TacoForm(Form):
    protein = StringField("Protein")
    shell = StringField("Shell")
    cheese = BooleanField("With Cheese")
    extras = TextAreaField("Extras")