That error is seen from 'admin' & 'advanced' privilege level.
From 'diag' it works.
SANC1::> set diag
Warning: These diagnostic commands are for use by NetApp personnel only.
Do you want to continue? {y|n}: y
SANCL1::*> statistics volume show -aggregate ag_tier1
SANCL1 : 9/9/2019 13:03:39
*Total Read Write Other Read Write Latency
Volume Vserver Aggregate Ops Ops Ops Ops (Bps) (Bps) (us)
----- --------- ----------- ------ ---- ----- ----- --------- ----- -------
test svm01 ag_tier1 6120 6110 9 0 236372224 21263 196
Thanks,
-Ashwin