It sounds like that key in your ApplicationResources.properties file is missing... Check there and add it if you need to. Or perhaps your struts-config.xml isn't pointing to your ApplicationResources file at all.
you should have a similar line in your struts-config that points to your message bundle. Also make sure that you have all the necessary struts related jar's in tomcat/commons/lib.
A side note. I remember looking at the example struts apps that come with the install. I found that they aren't going to teach you "best practices" so you might want to look around on the o'reilly website for some of the example apps that come with their struts book or the wrox site for the same thing.
I myself am new to struts. If any of the above doesn't help you i suggest you get on the struts users mailing list. you would have 5 answers to this question in less than half an hour.
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