[Koha] koha error

[mihafan]

I modify the file koha-conf.xml from
/home/koha/koha-dev/etc/koha-conf-xml to allow Active Directory users
log in Koha
<config>
.......
......
 ......
 <useldapserver>1</useldapserver>
 <ldapserver id="ldapserver">
 <hostname>192.168.29.169</hostname>
 <base>dc=kohatest,dc=com</base>   <!-- kohatest is a domain which i
create in active directory -->
 <user>cn=kohuser,dc=test,dc=com</user>             <!-- DN, if not
anonymous -->
 <pass>kohuser</pass>          <!-- password, if not anonymous -->
 <replicate>1</replicate>       <!-- add new users from LDAP to Koha
database -->
 <update>1</update>             <!-- update existing users in Koha database -->
 <auth_by_bind>1</auth_by_bind> <!-- set to 1 to authenticate by
binding instead of password comparuseison, e.g., to use Active
Directory -->
 <principal_name>kohuser at kohatest.com</principal_name>
                                         <!-- optional, for
auth_by_bind: a printf format to make userPrincipalName from koha
userid -->
 <mapping>                  <!-- match koha SQL field names to your
LDAP record field names -->
      <firstname    is="givenname"      ></firstname>
      <surname      is="sn"             ></surname>
      <address      is="postaladdress"  ></address>
      <userid       is="uid"            ></userid>
      <password     is="userpassword"   ></password>
      <email        is="mail"           ></email>
      <categorycode is="employeetype"   >PT</categorycode>
   </mapping>
  </ldapserver>
 </config>
when inserted in the browser address error occurs
Software error:
/home/koha/koha-dev/etc/koha-conf.xml:217: parser error : Opening and
ending tag mismatch: pass line 203 and ldapserver
 </ldapserver>
              ^
/home/koha/koha-dev/etc/koha-conf.xml:222: parser error : Comment not terminated

^
/home/koha/koha-dev/etc/koha-conf.xml:222: parser error : Premature
end of data in tag pass line 203

^
/home/koha/koha-dev/etc/koha-conf.xml:222: parser error : Premature
end of data in tag ldapsever line 199

^
/home/koha/koha-dev/etc/koha-conf.xml:222: parser error : Premature
end of data in tag config line 179

^
/home/koha/koha-dev/etc/koha-conf.xml:222: parser error : Premature
end of data in tag yazgfs line 2

^ at /usr/lib/perl5/XML/LibXML/SAX/Parser.pm line 38
BEGIN failed--compilation aborted at /home/koha/kohaclone/C4/Auth.pm line 28.
Compilation failed in require at /home/koha/kohaclone/opac/opac-main.pl line 22.
BEGIN failed--compilation aborted at
/home/koha/kohaclone/opac/opac-main.pl line 22.