bdb error with 2.4.4alpha

Hi, I have just updated 2.4.3alpha to 2.4.4alpha, when restarting slapd I get following error:

bdb_db_open: dbenv_open(/var/lib/ldap) bdb_db_open: Database cannot be opened, err 22. Restore from backup! ====> bdb_cache_release_all bdb(o=avci,c=de): DB_ENV->lock_id_free interface requires an environment configured for the locking subsyst em bdb(o=avci,c=de): txn_checkpoint interface requires an environment configured for the transaction subsystem bdb_db_close: txn_checkpoint failed: Invalid argument (22) backend_startup_one: bi_db_open failed! (22) slapd shutdown: initiated