Не запускается rest приложение python

Делал rest приложение на python с некоторыми crud методами. Использовал для этого Flask, SQLAlchemy, Marshmallow и mySQL бд. Но приложение не хочет запускаться, не могу разобраться почему.

Файл crud.py:

import json

from flask import Flask, request, jsonify
from flask_sqlalchemy import SQLAlchemy
from flask_marshmallow import Marshmallow

with open('secret.json') as f:
    SECRET = json.load(f)

DB_URI = "mysql+mysqlconnector://{user}:{password}@{host}:{port}/{db}".format(
    user=SECRET["user"],
    password=SECRET["password"],
    host=SECRET["host"],
    port=SECRET["port"],
    db=SECRET["db"])

app = Flask(__name__)
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SQLALCHEMY_DATABASE_URI'] = DB_URI
db = SQLAlchemy(app)
ma = Marshmallow(app)

class VirtualAthletics(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(32), unique=False)
    age= db.Column(db.Integer, unique=False)
    creator = db.Column(db.String(32), unique=False)

    def __init__(self, name, age, creator):
        self.name = name
        self.age = age
        self.creator = creator


class VirtualAthleticsSchema(ma.Schema):
    class Meta:
        fields = ('name', 'age', 'creator')

virtual_athletic_schema = VirtualAthleticsSchema()
virtual_athletics_schema = VirtualAthleticsSchema(many=True)

@app.route("/virtual_athletic", methods=["POST"])
def add_virtual_athletic():
    virtual_athletic = VirtualAthletics(request.json['name'],
                                    request.json['age'],
                                    request.json['creator'])
    db.session.add(virtual_athletic)
    db.session.commit()
    return virtual_athletic_schema.jsonify(virtual_athletic)

@app.route("/virtual_athletic", methods=["GET"])
def get_virtual_athletic():
    all_virtual_athletic = VirtualAthletics.query.all()
    result = virtual_athletic_schema.dump(all_virtual_athletic)
    return jsonify({'virtual_athletic': result})

if __name__ == '__main__':
    db.create_all()
    app.run(debug=True, host='0.0.0.0')

Файл secret.json:

{
    "user": "lidl",
    "password": "New_password_1",
    "host": "127.0.0.1",
    "port": "3306",
    "db": "pythonLab"
}

Ошибки: