LUA Event Registration change

Hello! I wrote an addon a couple years ago that’s now broken with the Dragonflight changes.

here’s hte LUA error:
main.lua:22: Frame doesn’t have a “OnScroll” script

And the line of code that caused it:
LFGListFrame.ApplicationViewer.ScrollBox:HookScript(“OnScroll”, function(self,event,…) myaddon:ListChanged() end)

When I check fstack, it does show OnScroll as one of the events I can hook. What am I missing?