html error 404

[SheeppOSU]

I am getting the html error 404 and I don'y know why. I set it up as follows -

FlaskBlog
    |
    |--main
    |   |--__init__.py
    |   
    |--posts
    |   |--__init__.py
    |   |--forms.py
    |
    |--static
    |   |--a css file and directory full of pictures
    |
    |--Templates
    |    |--A ton of html templates
    |
    |--users
    |   |--__init__.py
    |   |--forms.py
    |   |--utils.py
    |
    |--__init__.py
    |--models.py
    |--site.db
run.py

Here is the code for run.py

from flaskblog import create_app

app = create_app()

if __name__ == '__main__':
    app.run(debug=True)

The code for flaskblog.__init__

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_bcrypt import Bcrypt as bc
from flask_login import LoginManager
from flask_mail import Mail
import os

db = SQLAlchemy()
bc = bc()
login_manager = LoginManager()
login_manager.login_view = 'users.login'
login_manager.login_message_category = 'info'
mail = Mail()

def create_app():
    app = Flask(__name__)

    SECRET_KEY = os.environ.get('SECRET_KEY')
    SQLALCHEMY_DATABASE_URI = os.environ.get('SQLALCHEMY_DATABASE_URI')
    MAIL_SERVER = 'smtp.googlemail.com'
    MAIL_PORT = 587
    MAIL_USE_TLS = True
    MAIL_USERNAME = os.environ.get('EMAIL_USER')
    MAIL_PASSWORD = os.environ.get('EMAIL_PASS')

    db.init_app(app)
    bc.init_app(app)
    login_manager.init_app(app)
    mail.init_app(app)

    from flaskblog import main
    from flaskblog import users
    from flaskblog import post

    main.add_routes(app)
    users.add_routes(app)
    post.add_routes(app)

    return app

In the main, users, and post folders, each of their __init__ functions has a function call add_routes which take the parameter app. The function creates a blueprint, creates routes with the blueprint, and then registers it at the end of the code. the forms are just forms for filling out specific things. and utils has send_mail and save_picture in it. models contains the User and Post class, children to db.Model. Thanks in advance for your help.