[Koha] Authenticate users with LDAP in KOHA 17.11

[sundar]

Hi,
First of all i am wondering,whether my emails are reached to group.

My problem is ,

I have configured Koha 17.11 in Debian 8.10. I  am facing problem with
configuring ldap with koha. I am getting following error with following
configuration. can any one guide me to work it out?

Note: I am using anonymous ldap.


Configuration:
 <useldapserver>1</useldapserver><!-- see C4::Auth_with_ldap for extra
configs you must add if you want to turn this on -->
<ldapserver id="ldapserver"  listenref="ldapserver">
  <hostname>ldap://10.2.1.1</hostname>
  <base>dc=domain,dc=domain,dc=domain</base>
  <user></user><!-- DN, if not anonymous -->
  <pass></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 comparison, e.g., to use A$
  <principal_name>uid=%s,ou=Accounts,dc=internal,dc=cdsc,
dc=ac,dc=th</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 -->
   <userid       is="uid"></userid>
   <password     is="userpassword"></password>
   <email        is="mail"></email>
  </mapping>
</ldapserver>


Error:

Software error:

Error reading file /etc/koha/sites/cselib/koha-conf.xml.
Try running this again as the koha instance user (or use the
koha-shell command in debian)

Compilation failed in require at /usr/share/koha/lib/C4/Auth.pm line 29.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Auth.pm line 29.
Compilation failed in require at
/usr/share/koha/opac/cgi-bin/opac/opac-main.pl line 23.
BEGIN failed--compilation aborted at
/usr/share/koha/opac/cgi-bin/opac/opac-main.pl line 23.



-- 
Regards,
sundAr g