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I'm going crazy I can't understand why it doesn't work ...

I have this web page with this html:

I am new in Python Flask and I am trying to design my personal blog. Since it is only for private use, I would like to put the "add" page for post as protected area with a username and a password just for to add and manage my posts. In order not to show the login credentials in the source code, I decided to store in a .yaml file and retrieve them ({"Franz":{"pw":"Biberkopf"}}) through the function login.

But when I put "Franz" as username and "Biberkopf" as password, I get this error:

werkzeug.exceptions.BadRequestKeyError

werkzeug.exceptions.BadRequestKeyError: 400 Bad Request: The browser (or proxy) sent a request that this server could not understand.
KeyError: 'pw'

Traceback (most recent call last)

File "C:\Users\franc\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\flask\app.py", line 2464, in call

return self.wsgi_app(environ, start_response)

File "C:\Users\franc\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\flask\app.py", line 2450, in wsgi_app

response = self.handle_exception(e)

File "C:\Users\franc\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\flask\app.py", line 1867, in handle_exception

reraise(exc_type, exc_value, tb)

File "C:\Users\franc\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\flask_compat.py", line 39, in reraise

raise value

File "C:\Users\franc\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\flask\app.py", line 2447, in wsgi_app

response = self.full_dispatch_request()

File "C:\Users\franc\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\flask\app.py", line 1952, in full_dispatch_request

rv = self.handle_user_exception(e)

File "C:\Users\franc\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\flask\app.py", line 1821, in handle_user_exception

reraise(exc_type, exc_value, tb)

File "C:\Users\franc\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\flask_compat.py", line 39, in reraise

raise value

File "C:\Users\franc\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\flask\app.py", line 1950, in full_dispatch_request

rv = self.dispatch_request()

File "C:\Users\franc\AppData\Local\Programs\Python\Python38-32\Lib\site-packages\flask\app.py", line 1936, in dispatch_request

return self.view_functionsrule.endpoint

File "C:\Users\franc\OneDrive\Desktop\Blog_Project\blog_prova.py", line 102, in login

user.id = username
flask_login.login_user(user)
return redirect(url_for("add"))
else:
error = "Leider haben Sie die falschen Zugangsdaten."
return render_template("login.html", error=error)
return render_template("login.html")

Code:

I have two classes, Ignicoes and Ocorrencias: Ignicoes class:

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This is the code:

I have a problem, it's my fault, but I'm trying to solve this...

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