CategoryWalker is currently disabled--please restore

[Valtara]

Could you please restore this feature. I am receiving the error message "The CategoryWalker is currently disabled" when I filter some scores like in the link below, and then select the "Sort this list by work type, instrumentation, composer, and more" link near the top of the page. I have tried this for multiple kinds of searches, and also on multiple browser types (latest Chrome & Edge versions). Thanks.

https://imslp.org/index.php?title=Categ ... e:Catintro