Intricate error message - "TJSONlist use only Integer indexes - not String"

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What steps will reproduce the problem?
1. Using method TJSONlist.NameOf[]

What is the expected output? What do you see instead?
I advise you to use the message "List/array values ​​are not named!". 
Because I use Integer Index in method NameOf, I don't understand the message 
"TJSONlist use only Integer indexes - not String"

Original issue reported on code.google.com by ruslan.p...@gmail.com on 26 Oct 2012 at 1:24