I'm stumped anybody know what is causing this?
Yep, it means that the version of E that you're running is too old for the theme. Often the themes on http://e.themes.org/ are designed for the bleeding edge version of enlightenment (currently DR16-cvs).
At the moment, enlightenment's theme language is changing rather quickly, so these themes from DR16 can't be understood by DR15 and DR15.5. All I can suggest is that you download a few more and keep trying - *most* of them should work in DR15.5 from what I can tell.
Paul
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