New Blog Templates - Cannot modify header information

Hello!

Today we tried your "New Blog Templates" plugin - it works great, thank you! But when I try to copy "Categoties, Tags, and Links", I get a message `string(24) "CLEAR TABLE: wp_52_terms"
Warning: Cannot modify header information - headers already sent by (output started at .../wp-content/plugins/blogtemplates/blogtemplatesfiles/copier.php:248) in .../wp-includes/pluggable.php on line 1121`
when trying to create a new site in my network. When "Categoties, Tags, and Links" are not checked everything is ok, no warning messages.

What is the problem? Help pls!