LDAP error 'No LDAP Host given!"

ldap
9.1.x
help

#1

Hello all,

I have a problem with LDAP integration. I wish to add LDAP server to the control panel. After I field all text areas I press a button for fetching DN (or users?). But I have no success and in a main log appears next string:
{"reqId":"2KKqeFgLCjNSlU7KaAXT","remoteAddr":"$IP HERE","app":"user_ldap","message":"Configuration Error (prefix ): No LDAP Host given!","level":2,"time":"2016-12-01T08:37:01+00:00","method":"POST","url":"\/apps\/user_ldap\/ajax\/wizard.php","user":"admin"}

Please help me!