在后台更新缓存的时候

在后台更新缓存的时候出现这样的错误，不知道有人见过吗
Warning: include_once(forumdata/cache/style_1.php) [function.include-once]: failed to open stream: No such file or directory in E:\UserFreeHost\www.likepk.com\include\cache.func.php on line 177

Warning: include_once() [function.include]: Failed opening 'forumdata/cache/style_1.php' for inclusion (include_path='.;C:\php5\pear') in E:\UserFreeHost\www.likepk.com\include\cache.func.php on line 177