[plt-scheme] Doubt in exercise 16.2.5

Hi! I am Renato from Brazil

In the exercise 16.2.5, I cannot solve the problem, 
because I don't have any idea how to work with the error messages.

"dir-content: expects argument of type <struct:dir>; given (list (make-dir 'Text (list 'part1 'part2 'part3)) (make-dir 'Libs (list (make-dir 'Docs (list 'read)) (make-dir 'Codes (list 'hang 'draw)))))"

What do you suggest?

Thanks
Renato.
  

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