Chapter 4 challenge Swift v_3.0

does anyone have solution to the final challenge of the chapter 4 for swift apprentice. the one provided in the bundle gives an error while opening the file.

The playground works fine for me. Please let me know what error do you have exactly when you get a chance. Thank you! :]

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this is the error that I get

Please use the playground for chapter 4 challenges, not 5 in the same folder instead. It has all the challenges including also the last and final one as well and it works. Please let me know if you have any other questions or issues regarding the whole thing. Thanks! :]

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