Index: /trunk/xpressme_integration_kit/wp-content/themes/xpress_default/blocks/category_block_theme.php
===================================================================
--- /trunk/xpressme_integration_kit/wp-content/themes/xpress_default/blocks/category_block_theme.php	(revision 361)
+++ /trunk/xpressme_integration_kit/wp-content/themes/xpress_default/blocks/category_block_theme.php	(revision 362)
@@ -38,5 +38,12 @@
 			'depth' => $depth
 		);
-		$block['categories'] = wp_list_categories($param);
+		if ( xpress_is_wp_version('>=','2.3') ) {
+			$block['categories'] = wp_list_categories($param);
+		} else {	// not suport echo flag
+			ob_start();
+			wp_list_categories($param);
+			$block['categories'] = ob_get_contents();
+			ob_end_clean();
+		}
 	} else {
 		if (empty($show_option_all))