Index: branches/version-2_12_3/html/install/index.php
===================================================================
--- branches/version-2_12_3/html/install/index.php	(revision 22206)
+++ branches/version-2_12_3/html/install/index.php	(revision 22261)
@@ -198,5 +198,5 @@
 
         //マスターデータのキャッシュを削除
-        $cache_dir = '../../data/cache/';
+        $cache_dir = DATA_REALDIR . 'cache/';
         $res_dir = opendir($cache_dir);
         while ($file_name = readdir($res_dir)){