I want to use a Toolset Form to establish a relationship between an 'Exposant' and a 'Subrubriek', but seem unable to do so. Because the dropdown displayed on the front-end shows no options.
I'm getting following error in the console, see attached.
I'm using the latest version of Toolset Forms and Types.
Visiting the page and seeing the warning and then the error, it looks as if the problem relates to how and when the code on the page is loaded.
Could you please test in a minimal environment, that is to say, with all plugins except Toolset Forms and Types disabled, and with a default theme, e.g. twentytwentyone.
Does the error still occur? Probably something is affecting the order or timing of loading the JS on the page.
If so you may be able to identify what through a process of elimination as you reactivate plugins and your theme.