[Python] Why is Flask giving 404 error for all routes?

Flask is returning a 404 error for all routes, even the '/' route.

I do have a lot of code but I don't know how to reduce it for this question.

Here is a few of the files:

main.py

from flask import Flask, render_template

app = Flask(__name__, instance_path='/Users/aditgar/PycharmProjects/100daysofcode')
@app.route('/')
def get_all_posts():
return render_template('test.html')



test.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<h1>WORKSSHDJJDS</h1>
</body>
</html>


This is just a MRE of the real version, which uses SQLAlchemy, sqlite, e.t.c.

This was working perfectly until is stopped working all of a sudden, I am confused what the error is.

Editor: VS Code

This is from a Python course online called "100 Days of Code".

Here is what I got from my flask list:

Endpoint Methods Rule
---------------- --------- ---------------------------------
about GET /about
add_new_post GET, POST /new-post
bootstrap.static GET /bootstrap/static/<path:filename>
ckeditor.static GET /ckeditor/static/<path:filename>
contact GET /contact
delete_post GET /delete/<intost_id>
edit_post GET, POST /edit-post/<intost_id>
get_all_posts GET /
login GET, POST /login
logout GET /logout
register GET, POST /register
show_post GET /post/<intost_id>
static GET /static/<path:filename>

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