Accessed None Variable?

I continue to get this error over and over, and every-time it seems to pertain to a function node, yet the function has nothing to do with the variable. If I expand the function that the error is being called on, the error goes away and pops up on another unction that has nothing to do with the variable. I have stopped chasing and it is now stuck saying the AddtoViewport function when I create a UMG. I do not see how that variable effects the functions I expanded. Anyone experience this before?