[Python] ModuleNotFoundError: no module named 'flask_sqlalchemy'

I was following a Youtube flask tutorial, and I keep getting this module not found error. I have doouble checked the installation of sql alchemy, and it was done correctly. I am not sure why I am getting this error. Here is my code:

from flask import Flask, redirect, url_for, render_template, request, session, flash
from datetime import timedelta
from flask_sqlalchemy import SQLAlchemy



app = Flask(__name__)
app.secret_key = "hello"
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///users.sqlite3'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.permanent_session_lifetime = timedelta(days=5)

db = SQLAlchemy(app)

class users(db.Model):
_id = db.Column("id", db.Integer, primary_key=True)
name = db.Column(db.String(100))
email = db.Column(db.String(100))

def __init__(self, name, email):
self.name = name
self.email = email


@app.route("/")
def home():
return render_template("index.html")



@app.route("/login", methods = ["POST", "GET"])
def login():
if request.method == "POST":
session.permanent = True
user = request.form["nm"]
session["user"] = user

found_user = users.query.filter_by(name=user).first()
if found_user:
session["email"] = found_user.email

else:
usr = users(user, "")
db.session.add(usr)
db.commit()

flash("Login successful!")
return redirect(url_for("user"))

else:
if "user" in session:
flash("Already logged in!")
return redirect(url_for("user"))
return render_template("login.html")


@app.route("/user", methods = ["POST", "GET"])
def user():
email = None
if "user" in session:
user = session["user"]

if request.method == "POST":
email = request.form["email"]
session["email"] = email
found_user = users.query.filter_by(name=user).first()
found_user.email = email
db.commit()
flash("Email was saved.")
else:
if "email" in session:
email = session["email"]

return render_template("user.html", email = email)
else:
flash("You are not logged in.")
return redirect(url_for("login"))


@app.route("/logout")
def logout():
flash("You have been logged out", "info")
session.pop("user", None)
session.pop("email", None)
return redirect(url_for("login"))


if __name__ == "__main__":
with app.app_context():
db.create_all()
app.run(debug=True)





I have also double checked the python interpreter, and made sure it is the one with the virtual environment.

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