.html im Category name URL giving 404 error.

hi,

First of all thanks for a long awaited plugin.
It does its job. applying .html extension to category name. But my site getting 404 error.

I activated the plugin and in my permalink custom structure /%postname%.html

everything works. but the one i am looking is to add .html extension to category name gives 404.

http://www.duscbt.com/compiere-news.html

if you could access it without .html.. the page loads.
i.e http://www.duscbt.com/compiere-news

let me know how i resolve. this. again thank for your plugin.

best regards,
john.

http://wordpress.org/extend/plugins/html-in-category-and-pages/