Some people have reported issues with the AWSOM News Announcement plugin and WordPress 2.2.1, a new version of the plugin is available to correct this issue. Download it from the News Announcement product page.

UPDATE:
To fix an existing error do the following:
Deactivate the old plugin. Delete the older plugin files from your server. move the new plugin files to the server. Activate the new version of the plugin.

If you are experiencing any problems please contact me through the contact form or by posting on the Harknell.com AWSOM support forums.