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I don't know how the showcase system works but I'm going to guess that it threw an error because you modified the generator code. From your source you have:
META NAME="Generator" CONTENT="John Sherry Copyright 2012"
Try leaving this as the default concrete5 and it should be OK.
I think the meta tag you want to use would be:
meta name="copyright" content="John Sherry"
The generator tag is generally used for the underlying software that generated the page.
Cheers,
Anthony