Directory GetFiles failing on assign

I am trying to complete Lesson 2 (Control Flow Part 2) on the UiPath Academy… the read files exercise. However, I keep getting an error message saying the path element of my Directory.GetFiles(selectedFolder) is null.

Any ideas what I’m doing wrong? Does anyone have an example of the completed exercise to compare to?

@Jeff_Weisman check whether path complete and correct. Give files path in double quotes. If possible share screenshot of that activity with details