Ah, you are referring to one of the commands in a group of xml commands that was in an attachment that I posted several months ago. Sorry, I didn't know what you were talking about until I went through the whole thread, then downloaded the attachment and looked at the actual commands. It is sometimes hard to keep track of all the threads. At first I thought you had just come up with your own command, but I thought it odd that you would announce that it didn't work without telling us what you tried to do.
Anyway, I tested the command that I posted earlier and it works fine so I guess it may have something to do with your database setup, if it is not the standard XBMC setup. Not much I can do about it though.
Most likely you need to look at this line and adapt it to work with your setup:
queryvideodatabase(select strTitle ||", "|| c00 from episodeview order by idEpisode desc limit 5)
I don't even remember what the || is for... maybe your SQL setup doesn't like it. I think the || is probably a way of concatenating the two columns together with a comma between them. So for a quick test you can try to get just the episode name like this:
queryvideodatabase(select strTitle from episodeview order by idEpisode desc limit 5)
and if that works, then we can try to figure out how to do concatenation using whatever sql setup you have.