“NoSuchWindowException: no such window: window was already closed” while switching tabs using Selenium and WebDriver through Python3

I have a form that opens in a new tab when I click on it. When I try to navigate to that new tab, I keep getting a NoSuchWindowException. Code is pretty straightforward. ‘myframe’ is the frame within the new tab that the information will eventually get plugged into. Should I be waiting for something else?

Flask view shows 400 error instead of template with form

I’m trying to display a page with a form, then add a Player to the database when the form is submitted. However, I can’t view the form because the browser always shows a 400 Bad Request error. Other posts indicate that this could be because the name of the form input doesn’t match the key I get from request.form, but all my keys match. Why do I get this error?