NSArray element failed to match the Swift Array element type

Hey guys, I am doing the App Development with Swift book and have reached the “Apple Pie” project. Everything was going fine until the very last function “enableLetterButtons(_ enable: Bool)” when I try to run the app with this code I get only a white screen in Simulator and the above error “NSArray element failed to match the Swift Array element type”  in Xcode. Am I missing something here? Really appreciate any help.

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