What to do about this error message?

I’ve never seen this before. When I close it my GH file proceeds normally. Should I check the “Do not show…” box and just ignore it?

I discovered that the problem is within a cluster that has about 30 components in it. The error box does not appear if the cluster is disabled. The cluster looks fine when I open it. I’ll try Exploding it and re-making it.

Good news! Exploding and re-making the cluster fixed the problem. So I’ll leave this post online in case anyone else encounters the problem.