CaRP : Caching RSS Parser : Error : Failed to open local file

CaRP: Caching RSS Parser - Documentation

CaRP was unable to open a feed stored on your server.

You are trying to pass arguments into a script that generates a feed: For example, if your feed is http://example.com/feed.php?topic=1, You cannot load it like CarpShow('/home/me/public_html/feed.php?topic=1');. Instead you must enter the HTTP URL like this: CarpShow('http://example.com/feed.php?topic=1');
The path to the feed is incorrect: Fix the path. Be sure to take into account any differences between what the path looks like when you FTP to your server and what it looks like to CaRP. The difference will be the same as the difference between the FTP path to carp.php and the path that the installation script gave you for the "require_once" line that you use to load CaRP.
The feed file is missing: Upload or otherwise generate the file.
The access permissions for the feed file or any of the folders containing it don't allow CaRP to read it: Fix those access permissions.