How can I handle the error?-php Tutorial

Please kindly help to correct the error. Warning: chkinput: include (connconn. php) [chkinput. include]: failedtoopenstream: NosuchfileordirectoryinD: Callback. phponli
Please kindly help me to correct the error

Warning: chkinput: include (conn/conn. php) [chkinput. include]: failed to open stream: No such file or directory in D: \ AppServ \ www \ xiaoyuan \ admin \ chkadmin. php on line 15

Warning: chkinput: include () [function. include]: Failed opening 'Conn/conn. php 'for declaration (include_path = '.; c: \ php5 \ pear ') in D: \ AppServ \ www \ xiaoyuan \ admin \ chkadmin. php on line 15

Warning: mysql_query (): supplied argument is not a valid MySQL-Link resource in D: \ AppServ \ www \ xiaoyuan \ admin \ chkadmin. php on line 16

Warning: mysql_fetch_array (): supplied argument is not a valid MySQL result resource in D: \ AppServ \ www \ xiaoyuan \ admin \ chkadmin. php on line 17



The following is the chkadmin. php code.
Header ("Content-type: text/html; charset = gb2312"); // sets the file encoding format
Class chkinput {
Var $ name;
Var $ pwd;

Function chkinput ($ x, $ y)
{
$ This-> name = $ x;
$ This-> pwd = $ y;
}

Function checkinput ()
{
Include ("conn/conn. php ");
$ SQL = mysql_query ("select * from tb_admin_user where name = '". $ this-> name. "'", $ conn );
$ Info = mysql_fetch_array ($ SQL );
If ($ info = false)
{
Echo"