Open the website projektlemon.de in a browser.
Instead of the homepage, the application crashes and displays a traceback.
Error Details:
The server is throwing a werkzeug.routing.exceptions.BuildError.
Error message: Could not build url for endpoint 'serverspage'. Did you mean 'saveservertag' instead?

Context:
According to the traceback, the exception occurs in app.py (line 355) inside the index function while rendering the template. It looks like a urlfor('serverspage') call in the template is failing because the route is either missing, renamed, or not registered correctly.