Ошибка: IntegrityError sqlalchemy.exc.IntegrityError: (sqlite3.IntegrityError) NOT NULL constraint failed

from flask import Flask, render_template, request, redirect
from flask_sqlalchemy import SQLAlchemy
 
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///site.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)
class Item(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(100), nullable=False)
    type = db.Column(db.String(100), nullable=False)
 
 
 
@app.route('/')
def index():
    return render_template('2index.html')
 
 
@app.route('/about')
def about():
    return render_template('2about.html')
 
 
@app.route('/profile')
def profile():
    return render_template('2profile.html')
 
 
@app.route('/create', methods=['POST','GET'])
def create():
    if request.method == "POST":
        title = request.form['title']
        type = request.form['type']
 
        item = Item(title=title, type=type)
 
 
        db.session.add(item)
        db.session.commit()
        return redirect('/')
 
    else:
        return render_template('2create.html')
 
 
if __name__ == '__main__':
    app.run(debug=True)