Pagination doesn't work

Thanks for RecentTopics. Works great. However, I have a problem with pagination.
I am using the recent topic with usu ( Ultimate phpBB SEO Friendly URL ). 

Links that display are:
/page5.html
/page10.html
/page15.html
.
.
.

Each page displays: "Requested page not found."

I am asking for help in this matter.