Delete by age

I gen an error when I am using the lifespan setters in the UI and click the icon next to them.
It creates a Magma modifier but it’s empty and there’s no delete.

BTW, I have a question - when caching to PRTs is on and I click simulate, is modifier stack evaluated prior to saving or afterwards?

What is the error?
Please copy and post everything that appears in the MAXScript listener.
You can also create a screenshot of any error dialogs.