The 'quick_report' function in the 'arcgis.gis.server' sub module fails if any custom reports exist on the server.

Workaround

Use Python 'Requests Module' to generate the report directly from the ArcGIS Server Administrator API.

import requests

parameters = {

  'f': 'json',

  'token': '<token>'

}

r = requests.get("https://<FQDN>/server/admin/usagereports", params=parameters, verify=False)

print(r.text)

Steps to Reproduce