错误提示如下：
PHP Warning: include_once(UC_CLIENT_ROOT./client.php) [function.include-once]: failed to open stream: No such file or directory in E:\wwwwww\tok173com\modules\login.mod.php on line 89 PHP Warning: include_once() [function.include]: Failed opening 'UC_CLIENT_ROOT./client.php' for inclusion (include_path='.;C:\php5\pear') in E:\wwwwww\tok173com\modules\login.mod.php on line 89 PHP Fatal error: Call to undefined function uc_user_login() in E:\wwwwww\tok173com\modules\login.mod.php on line 115