rootnas_fs -delete → Error 2201: unable to acquire lock(s), try later

Hi! What should I do to make this fs ckpt deletable?

Harri

[nasadmin@vnx2-cs0 ~]$ /nas/sbin/rootnas_fs -info id=175
id        = 175
name      = ckpt_tsint_weekly_006_replica2
acl       = 0
in_use    = True
type      = ckpt
worm      = off
volume    = vp308
block dedup = Disabled
pool      = pool0
member_of =
rw_servers=
ro_servers= server_2
rw_vdms   =
ro_vdms   =
checkpt_of= vnx1_tsint_weekly Sun Sep 18 11:34:45 EEST 2016
deduplication   = Off
thin_storage    = True
tiering_policy  = Auto-Tier/Highest Available Tier
compressed= False
mirrored  = False
used      = 69%
full(mark)= 90%
stor_devs = CKM00152502724-0040
disks     = d10
 disk=d10   stor_dev=CKM00152502724-0040 addr=c0t1l0         server=server_2
 disk=d10   stor_dev=CKM00152502724-0040 addr=c16t1l0        server=server_2

[nasadmin@vnx2-cs0 ~]$ /nas/sbin/rootnas_fs -delete id=175 -option umount=yes
Error 2201: unable to acquire lock(s), try later