I'm running into some trouble adding my own CiviRule action. I've been able to add the action to the civirule_action table and confirmed it's showing up in the list of actions in the UI. Whenever I try to save the action in a rule I get the error, "Not a valid action, action class is missing".
I'm not sure if I have placed my php class file in the right location or if something else needs to be done. I'm running Wordpress 4.9.7, CiviCRM 5.2.2, and CiviRules 2.1. The php file is placed in /wp-content/plugins/files/civicrm/org.civicoop.civirules/CRM/CivirulesActions/
What could I be missing?