How to find pages with missing plug ins

I have an old RW page that has been updated over the years. When it starts it says its missing two plug ins - Partitions and Columns which I don’t need but have no idea what page is referencing it. How can i find that page to delete it so the error does not come up when the program starts?

Each of these should be a single page on your site. You should be able to spot them because they will be the ones in the list of pages that have generic icons. What the icon looks like will depend on which version of RapidWeaver you’re using, but the generic icon has always looked sort of like a plain white lego brick of some sort.