routing: Fix breakages with routing on some versions of Python. Finally figured what happened with change 6baa94da8b16 (this is a Mercurial hash by the way if you're looking at the Git mirror). Between Python 3.6 and 3.7 there was a change where the percent sign ('%') went from being escaped by `re.escape` to _not_ being escaped. So now we need to use different regex patterns dependin on the Python version, yay.

---
title: PieCrust System Messages
---

Here are the **PieCrust** system message pages:

* [Requirements Not Met]({{ pcurl('requirements') }})
* [Error]({{ pcurl('error') }})
* [Not Found]({{ pcurl('error404') }})
* [Critical Error]({{ pcurl('critical') }})

This very page you're reading, however, is only here for convenience.