我的论坛安装成功后，用管理员进去没一点问题，但新注册用户时出现问题，显示如下：

Dvbbs.php info: MySQL Query Error
php_errormsg:Undefined variable: myuserid
The URL Is: http://bbs.******.net/reg.php?action=save
Errno: 1064
Error: You have an error in your SQL syntax near '(Select userid From dv_user Where username='小洁') union all (Select userid From' at line 1
SQL: (Select userid From dv_user Where username='小洁') union all (Select userid From dv_user Where useremail='12345@sohu.com')
You Can Get Help In: http://bbs.cndw.com

我的可以注册