Azureus Error: Malformed RSS XML: The reference to entity "xxx" must end with the ';' delimiter.

I have Azureus set up with the RSSFeed Scanner plugin to check a few Mininova torrent feeds for a few shows. I recently started getting the error:

Malformed RSS XML: The reference to entity “num” must end with the ‘;’ delimiter.

The problem was that I neglected to encode an ampersand in the feed url. For instance, the feed URL

http://www.mininova.org/rss.xml?cat=8&num=50

will cause an error. Instead it should read as the following:

http://www.mininova.org/rss.xml?cat=8&num=50

This is what the feed options should look like: