UiPath Close Application Activity Value does not fall within the expected range.

While working in UiPath on a UCCX related RPA robot I found the Close Application activity was raising an exception

Main has thrown an exception

Source: Close application

Message: Value does not fall within the expected range.

I couldn't find a solid example of how to implement it correctly in the UiPath documentation but did find the UiPath Academy does provide a sample with the answer.  Ultimately you need to populate the Close Application Target.Selector property correctly.  It does not automatically inherit it from a Open Application activity.

Selector not populated

Selector populated (notepad.exe example)

You can find the appropriate value by one of two ways.  Simply using the Indicate on Screen feature of the Close Application activity to point to a running instance of your application will automatically populate the Target.Selector property.

No Screenshot Selected

Notepad selected (with error message)

Alternatively, you can use the UiExplorer on the Studio menu to find your application XML snippet and populate it manually.

I, for one, welcome our new RPA overloards.