ResearchKit error: 'Could not add Keychain item' for ORKPasscodeStep after converted to Swift 3

Apple ResearchKit project: after updated to XCode 8 and converted to Swift 3, getting the error message 'Could not add Keychain item.' for ORKPasscodeStep. Is it a framework bug? Thanks in advance!

Solution

Try enabling the Keychain Sharing capability for your app. See here for more info.

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