ASP总是出错,The page cannot be displayed

出错信息：
The page cannot be displayed
There is a problem with the page you are looking for, and it cannot be displayed.

Please try the following:

    * Contact the Web site administrator to inform them that this error has occured for this URL address.

HTTP Error 500 - Internal server error.
Internet Information Services (IIS)

Technical Information (for support personnel)

    * Go to Microsoft Product Support Services and perform a title search for the words HTTP and 500.
    * Open IIS Help, which is accessible in IIS Manager (inetmgr), and search for topics titled Web Site Administration, and About Custom Error Messages.
    * In the IIS Software Development Kit (SDK) or at the MSDN Online Library, search for topics titled Debugging ASP Scripts, Debugging Components, and Debugging ISAPI Extensions and Filters.

服务器在国外，页面代码是：
HTML code:

<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>
<%
'/******************设置Session.Timeout时间参数********************/
session.Timeout=20 '这里的10指的是10分钟


'/*****************设置模式，详情看下面的说明或联系www.eexe.net ******************/
dim usermode
usermode=1 '可选值1,2,3；默认值为1
Dim db,con