Since Mixmeister cataloged most of my mp3s on my backup computer they will no longer play in Hoster, I get the same error message as you.
Apparently the cataloging process changed them in such a way that Hoster doesn't recognize them.
Check the "modified" date on them. Unless you've changed their name or id tag since you ripped them the modified date should be the same as the created date.
If you want to mail me one at Karaokespotlight at cs dot com, I can try it on my computer
Sam
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