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I included this code in my template <link rel="shortcut icon" href="{{ url_for('static', filename='icons/favicon.ico') }}">

and now I get this error

jinja2.exceptions.TemplateNotFound: favicon.ico.html 2023-05-15 07:22:03,092: Exception on /page/2 [GET] Traceback (most recent call last): File "/home/japanfelipe/.virtualenvs/myvirtualenv/lib/python3.10/site-packages/flask/app.py", line 2190, in wsgi_app response = self.full_dispatch_request() File "/home/japanfelipe/.virtualenvs/myvirtualenv/lib/python3.10/site-packages/flask/app.py", line 1486, in full_dispatch_request rv = self.handle_user_exception(e) File "/home/japanfelipe/.virtualenvs/myvirtualenv/lib/python3.10/site-packages/flask/app.py", line 1484, in full_dispatch_request rv = self.dispatch_request() File "/home/japanfelipe/.virtualenvs/myvirtualenv/lib/python3.10/site-packages/flask/app.py", line 1469, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) File "/home/japanfelipe/mysite/flask_app.py", line 517, in page news_list = df_news.iloc[start_index:end_index].to_dict('records') NameError: name 'df_news' is not defined

That change would not cause that error. The error is because you are trying to use a variable that you have not assigned a value to in your code. Check your code and make sure that the variable df_news is assigned a value before you try to use it.