php开发遇到错误 Creating default object from empty value 求大神帮忙解决下

代码:
14 define('IN_ECS', true);
15 $smarty->left_delimiter = '<!--{';
16 $smarty->right_delimiter = '}-->';
17 require(dirname(__FILE__) . '/includes/init.php');
18 if ((DEBUG_MODE & 2) != 2)
19 {
20 $smarty->caching = true;
21 }

报错:Strict Standards: Creating default object from empty value in D:\AppServ\www\ahome\index.php on line 15

还没有$smarty， 我猜应该15，16移到17后面？