Property nodes are never multidimensional. To modify the properties for multiple plots, you first specify the active plot, select the properties you want, specify another active plot, select the properties again, etc.
When do you get these messages? Do you have automatic error handling and dialogs turned on?
I'm also a bit confused about what you're trying to do with the bundle of the array and the two scalars and trying to wire the output to a chart. As the broken wire indicates, that's not valid.