I think I have the same promblem like this. I have WP Twenty Eleven and I get the sign:
The following files “gallery-template.php” and “gallery-single-template.php” were not found in the directory of your theme. Please copy them from the directory /wp-content/plugins/gallery-plugin/template/ to the directory of your theme for the correct work of the Gallery plugin
But I don’t now what this means and what I have to do and what/where to change. Can anybody explain it to me?
