I am trying to download flask-wtf systemwide with

So I am getting RuntimeError: Install Flask with the 'async' extra in order to use async views. as said in the tile I tried pip install flask[async] but it says that it is already installed I tried uninstalling it and installing it again but nothing I am using @app.route like they said but I still get the RuntimeError what can I do?

Here is my app.py file and when I am running with flask but when i am running this with my flask and try to login then it is showing this error

So I’m new to flask and am trying to make a library website with flask and mongoDB but everytime I search for the books and try to click on the result for more information about the book it doesn’t seem to call the function. I’m trying to sort of get the book ID of the results that come with it so I’m trying to hide it in a div that won’t be shown.