The $topic variable has been omitted from the readTemplate call on line 133 of the prieview script.
Also, there is a typo ('use Category') in the twikicatitems.tmpl comment line relating to the
UseCategory syntax.
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BenPhillips - 20 Dec 2000
This is no longer relevant sice the 01 Sep 2001 release.
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PeterThoeny - 23 Nov 2001