[Koha] error initializing Koha

[anabela semedo]

Hello everyone, today when initializing the koha I came across this error. all the functioning of the library is stopped at this moment. Does anyone know how to solve it?
Software error:

No "ldapserver" in server hash from KOHA_CONF: /etc/koha/sites/kohabncv/koha-conf.xml at /usr/share/koha/lib/C4/Auth_with_ldap.pm line 58.
Compilation failed in require at /usr/share/koha/lib/C4/Auth.pm line 69, <DATA> line 755.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Auth.pm line 93, <DATA> line 755.
Compilation failed in require at /usr/share/koha/intranet/cgi-bin/mainpage.pl line 25, <DATA> line 755.
BEGIN failed--compilation aborted at /usr/share/koha/intranet/cgi-bin/mainpage.pl line 25, <DATA> line 755.


For help, please send mail to the webmaster ([no address given]<mailto:[no%20address%20given]>), giving this error message and the time and date of the error.



Ana Bela Semedo