[Nfs-ganesha-support] RecoveryBackend Unknown recovery backend

I be trying to set up nfs-ganesha as an cluster and store the recovery backend data in my ceph cluster. From fallowing the guide and using rados_kv and rados_ng, i get the error: "nfs4_recovery_init :CLIENT ID :CRIT :Unknown recovery backend" In fact testing all available options "fs, fs_ng, rados_kv, rados_ng" only the default (FS) works and dont give me the error am i missing something, i am using version 2.5.5, what i understand supports it. Thanks