i’m doing a bit of a Fullstack tutorial. So please don’t be mean this might be a noob Question:

I wrote this liddle small Flask Application out of a Tutorial

config.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy 
from flask_cors import CORS

app = Flask(__name__)
CORS(app)

app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///mydatabase.db"
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False

db = SQLAlchemy(app)

main.py

from flask import request, jsonify
from config import app, db
from models import Contact


@app.route("/contact", methods=["GET"]) # Decorator with route and method
def get_contact(): 
    contacts=Contact.query.all() # Uses Flask SQL Alchemy to get all Contacts inside the Database
    json_contacts = list(map(lambda x: x.to_json(),contacts)) # Call the List an MAP them into Json Content  
    return jsonify({"contacts":json_contacts}) # Write it in Json Data

if __name__ = "__main__": 
    with app.app_context(): # Does we have the Database?
        db.create_all()   # 
    app.run(debug=True)   # 

from config import db 

class Contact(db.Model): 
    id = db.Column(db.Integer, primary_key=True)
    first_name = db.Column(db.String(80), unique=False, nullable=False)
    last_name = db.Column(db.String(80), unique=False, nullable=False)
    email = db.Column(db.String(120), unique=True, nullable=False)

    def to_json(self):
        return {
            
            "id": self.id,
            "firstName": self.first_name,
            "lastName": self.last_name,
            "email": self.email,

        }

So in the Tutorial he just do python3 main.py and the Flask Server is starting. When Im doing this nothing happen. This Tutorial is just 3 Month old so sometimes i can’t believe the coding world. So that mean i have no mistakes in the Code itself.

so i tried : python3 -m flask --app main.py run Output Error: Failed to find Flask application or factory in module 'main'. Use 'main:name' to specify one.

I double checked if i have any bad Code in there. The problem might be not a coding mistake , more than i start the APP.

Can you help me?