Invalid action (&1) in function &2.
&1 - The action sent to the function.
&2 - The being called with an invalid action.
The structure page of the Websydian Express RPGDeveloper PageModeller contains an event which can be called with different actions (based on which of the buttons Add, Update, or Remove that has been pressed).
If the event is called with an unknown action, this message is written to the log.
There are two possible reasons for this situation to occur:
1. A program error setting or handling the wrong actions.
2. An attempt from a user to change the action manually.
If the same action occurs systematically in the log, it can be a case of a program error - report the situation to Websydian Support.