Unbound error in logs

[Phil.Scarr]

Does anyone have a lead on this and whether this is expected?

Jan 18 10:37:43 pfsense unbound: [27918:0] notice: Restart of unbound 1.6.0.
Jan 18 10:37:43 pfsense unbound: [27918:0] error: cannot chdir to directory:  (No such file or directory)
Jan 18 10:37:43 pfsense unbound: [27918:0] notice: init module 0: validator
Jan 18 10:37:43 pfsense unbound: [27918:0] notice: init module 1: iterator
Jan 18 10:37:43 pfsense unbound: [27918:0] info: start of service (unbound 1.6.0
).