Failed to post reporting data to serve

Chef Infra (archive)
1

Hi,

I would like does this log means? I try to google online but I cant find any solution to this.

[2016-04-27T18:07:16+08:00] ERROR: Failed to post reporting data to server (HTTP 500), saving to
 C:/chef/cache/failed-reporting-data.json
    - run 'chef-client -l info' on server01

Background:
I have setup my own chef server and I was running a cookbook to provision a VM from vSphere vCenter.