I see you are using a logic tag, but I do not see a <@taglib ...> declaration to use the logic tag library.
Is "org.apache.taglibs.standard.tag.el.core.OutTag" the full error message that you are getting?
What web server (incl version) are you using?
By the way, if you edit your post, and select the "Disable smilies in this post." option (below the "Instant Graemlins" section) your <cut> tags in your post will display properly - but you will need to remove the extra spaces the smilies put in.