hello..
I use PCAS v3.1.3 on WP2.8.
When I checked my website with Google Webmaster Crawler checker, it says many ‘unreachable’ (301) errors. There is something like this:
The nature of that is not really an error — basically, valid anti-spam audio file URLs are being indexed. Later as they expire, those pages are longer produce audio files and they inform you of this.
If it bothers you, you can change the behavior of this code:
if (is_null($cas_antispam)) wp_die($cas_displaytext['not_valid']);