Xcode 9 Update Caused Code to Break

When I push a UIBarButton in my app the app breaks at:

 

class AppDelegate: UIResponder, UIApplicationDelegate {


with the error saying:


2017-10-07 18:22:12.033188-0400 App Name[3285:927126] -[ tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x131e5df80

2017-10-07 18:22:12.034135-0400 App Name[3285:927126] *** Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘-[tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x131e5df80’

 

Before I took the Xcode 9 update everything was working fine.  Does anyone know what could be causing this code to break?

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