Return Node Error

What’s wrong with my Return Node? Why is this error even happening? It worked just fine until I tried to upgrade from 4.22.3 to 4.26.2. This one error is holding back all my developmental progress.

I figured the people in this forum were useless, considering their typical “just google it” responses, because they don’t know anything. Thankfully I know an expert and have no need to waste my time here any further.