Hey Michael,
I was able to reproduce your error on my ClearPass box. We've updated your skin (it was an old navigation element from the Amigopod days that was rarely used, and not used in ClearPass--hence generating the warning in the app log). We've commented out the offending code.
Please check for plugin updates (should be v0.1.12 of your particular plugin).
Please let me know if you run into any other issues or email the skins team @ dl-amigopod-skins@arubanetworks.com
Thanks!