I got this error after going through the new scene for Zaleria. Any ideas on how to fix it?

You're missing a file. Have you used the "update files only" but your version was older than one update ago? The update files are always for the last public update, they don't work with older versions.
The safest way to make sure that you have all the newest files now, is to download the full version of the game again, and copy&paste the entire content of the www/save folder of the old game location to the same folder in the new game location.