Predecessor Error

I keep getting errors for my predecessors in some areas.  I cannot replicate it or see what the issue is.  I've read a few other forum queries that mention that you cannot refer to a parent row, but sometimes this actually works for me (in fact it is nice that it works because it's easier than using a bunch of child row predecessors to denote when a group of items has completed for a new line to begin.

However, in this case, it is a child row and I'm getting the #REF error even upon reloading the page.  Please see a screenshot attached of me trying to refer to row 482 and then it showing an error when I do.