Index: wp-includes/comment-template.php
===================================================================
--- wp-includes/comment-template.php	(revision 14075)
+++ wp-includes/comment-template.php	(working copy)
@@ -890,7 +890,7 @@
 	elseif ( file_exists( TEMPLATEPATH . $file ) )
 		require( TEMPLATEPATH .  $file );
 	else
-		require( get_theme_root() . '/default/comments.php');
+		require( get_theme_root() . '/twentyten/comments.php');
 }
 
 /**