HTTP500-internal server exception

HTTP500-Internal server error help HTTP500-Internal server error server: IIS6 + PHP5.2.5 + PHP programs with DEDE installed in MYSQL are all very good. Today, a new program is installed successfully, most websites are normal. only one page has an "HTTP500-Internal Server Error", and GOOGLE is also baidu. you can also ask for help based on the solution HTTP 500-Internal server error provided on the Internet.
HTTP 500-Internal Server Error

Server: IIS6 + PHP5.2.5 + MYSQL

PHP programs that previously installed DEDE are very good. Today, a new program is installed successfully, and most websites are normal. there is only one page with "HTTP 500-Internal Server Error"

GOOGLE and Baidu, and tried the solution based on the solution provided on the Internet for a day. it was not solved in the middle of the night, so I came to ask for help.

The password is also set for IWAM_MAME.

I feel like my head is a little big.

Below is the code of the error file. Is there a problem with the file itself? please help me to see it. thank you for pulling it.

Require_once "global. php ";

If ($ user_id =-1) sysmsg ($ lang_sysmsg ['nologin'], 'index. php ');

$ Tpl-> set ('site _ title', $ nav ["pm"]. '-');

If ($ op = 'listpm '){

$ Str = "select t1.nickname, t2. * from friends_user as t1, friends_user_pm as t2 where pto = '$ username' and t1.username = t2.pfrom and box = '1 '";
$ CoObj = $ data-> getList ($ str, 20 );
$ CoObj-> navchar = $ lang_nav;
$ Tpl-> set ("navbar", $ coObj-> navbar (10 ));
$ Tpl-> set ("list", $ coObj-> field );
$ Tpl-> set ("pagejump", $ coObj-> pagejump ());
$ Tpl-> set ("pm_content", "pm_list.html ");
$ Tpl-> parse ("pm.html ");

} Elseif ($ op = 'viewpm '){

$ Vip <= 0 & sysmsg ($ lang ['VIP _ only'], 'person. php? Op = joinvip ');

// $ Id = $ _ GET ["id"];
$ Arr = $ db-> get_one ("select * from friends_user_pm where pto = '$ username' and id =' $ ID '");
$ Free = $ arr ["free"];
$ Flag = $ arr ["readed"];
/*
If ($ free = 0 & $ flag = 0)
{
If (! UpPoint ($ username, "ViewPm", "receive messages "))
{
Sysmsg ($ lang_sysmsg ['nopoints'], 'person. php? Op = buypoint ');
}
}
*/
$ Db-> query ("update friends_user_pm set readed = '1' where pto = '$ username' and id =' $ ID '");
$ Str = "select t1.nickname, t2. * from friends_user as t1, friends_user_pm as t2 where t1.username = t2.pfrom and t2.pto = '$ username' and t2.id =' $ ID '";
$ CoObj = $ data-> getList ($ str, 1 );
$ Tpl-> set ("list", $ coObj-> field );
$ Tpl-> set ("pm_content", "pm_view.html ");
$ Tpl-> parse ("pm.html ");

} Elseif ($ op = 'newpm '){

// $ Pmcount = $ db-> get_one ("select count (*) AS t FROM 'DS dS _ user_pm 'WHERE 'pfrom' = '$ username '");

// If ($ vip <= 0 & $ pmcount ['t'] = 3 ){
// Sysmsg ($ lang ['PM _ limit_novip '], 'person. php? Op = joinvip ');
//}

If (checksubmit ($ _ POST ["Submit"])
{
// $ From = $ _ POST ["from"];
// $ To = $ _ POST ["to"];
// $ Title = $ _ POST ["title"];
// $ Msg = $ _ POST ["msg"];
$ Time = date ("Y-m-d H: I: s ");
$ Db-> query ("insert into 'DS dS _ user_pm '('pfrom', 'pto ', 'title', 'MSG', 'ptime ') VALUES ('$ from',' $ to', '$ title',' $ msg ',' $ time ')");
$ Uinf = $ db-> get_one ("SELECT 'email 'FROM 'DS dS _ user' WHERE 'username' =' $ '");
Email_newpm ($ to, $ uinf ['email ']);
Sysmsg ($ system_msg [2026], 'person. php ');
}
Else
{
$ Tpl-> set ("from", $ username );
$ Tpl-> set ("to", $ _ GET ["to"]);
$ Tpl-> set ("pm_content", "pm_post.html ");
$ Tpl-> parse ("pm.html ");
}
} Elseif ($ op = 'delps '){
// $ Id = $ _ GET ["id"];
$ Db-> query ("delete from friends_user_pm where pto = '$ username' and id =' $ ID '");
Sysmsg ($ system_msg [2027], 'PM. php? Op = ListPm ');
}
?>





------ Solution --------------------
1. sending an error in IIS is enabled;
2. in IE, remove the hooks before "show Friendly http error messages" in "tools"-"internet options"-"advanced.

In this way, you can see the specific error message. debug the program according to the error location.
------ Solution --------------------
Because most websites are normal, only one page has an "HTTP 500-Internal Server Error"


Suggestion: you can also find the problem by using echo from one location.
------ Solution --------------------