Stargazer
So, what you were looking for was {{tag|Shallan's sketchbook|text=sketchbook}}. Looking at sketchbook pages from Oathbringer, I think we're just putting those tags in the type line now though. And looking at other sketchbook pages from WoK, I see that you were probably just copying from one of those pages (which ordinarily should be fine; I'm not sure why the tag is wrong on those pages, but I'm off to go fix it)
m