I am currently learning more and more on how to program in VBA. I am running into on issue which is <Expression not defined in context>. I do not really know what to look for to fix it. Setting a watch has not helped me in the slightest and every where I look I get these short complicated answers which are really helpful to anyone. If some can help as to what's going on. Is it because I am improperly calling a data range from two separate work sheets, or an error within using a function.
Range("Input!E10").Value = Application.WorksheetFunction.Index("PUE!C3:PUE!E21", "Input!A9", 3)