安装ECshop后出现的问题？

安装一切正常，安装完成后，进入前台和后台的页面都提示：Fatal error: main(): Failed opening required 'smarty/Smarty.class.php' (include_path='/Volumes/DATA/web/ecshop/;/Volumes/DATA/web/ecshop/include/;/Volumes/DATA/web/ecshop/include/class;') in /Volumes/DATA/web/ecshop/include/init.php on line 29

我检查过了，在/Volumes/DATA/web/ecshop/include/class中有smarty这一文件夹。

我用的是php 4.29+Mysql4.0.21