got error when execute pmm-admin purge

Fan Doesn’t work in 1.14.1

Client side.

sudo pmm-admin info
pmm-admin 1.14.1

PMM Server | 10.0.0.29 (password-protected)
Client Name | master-stewie
Client Address | 10.0.0.200
Service Manager | linux-upstart

Go Version | 1.10.1
Runtime Info | linux/amd64