SASL/OTP authentication started

Hi everybody, I want to use SASL/GSSAPI, but each time I try ldapwhoami or ldapadd, ldapmodify ... I get :

SASL/OTP authentication started ldap_sasl_interactive_bind_s: Invalid credentials (49) additional info: SASL(-13): user not found: no OTP secret in database

then I added "-Y GSSAPI" , I received:

ldap_sasl_interactive_bind_s: Unknown authentication method (-6) additional info: SASL(-4): no mechanism available: No worthy mechs found

more information: I have created a principal : ldapadmin@MYREALM to direct mapping rootdn. a principal for ldap service: ldap/host@MYREALM and have added a keytab file for ldap service, then I started slapd with option : -n ldap

Please suggest me any idea. Thank you.