We have installed a trial of Custom Field Manager for Jira in our production instance today. We are running Jira Server Version 8.5.2.
When I select Settings->Issues->Fields the screen keeps spinning for minutes, never brings back data.
When I click on F12 to see Console messages, I find the following message
Error: Given action "LOAD_FIELDS", reducer "fields" returned undefined. To ignore an action, you must explicitly return the previous state. If you want this reducer to hold no value, you can return null instead of undefined.
I’ve left the screen spinning for 30 minutes and it never comes back with data.