fix error

classes/fpf/cache/DefaultBaseImpl.php

@@ -18,7 +18,7 @@ class DefaultBaseImpl
     public static function checkTable($db_name, $table_name)
     {
         if (!isset(TableConstant::$table_list[$db_name . TableConstant::CONNECTOR_TAG . $table_name])) {
-            throw new Exception('hash table is not defined');
+            throw new \Exception('hash table is not defined');
         }
     }
 }