@tungdangplus  That didn't work for me. In AppDelegate, I did:     func applicationWillResignActive(_ application: UIApplication) {         let viewController = window?.rootViewController as! ViewController         viewController.disconnectAVPlayer()     } and then in ViewController, I did:     public func disconnectAVPlayer() {       playerViewController.player = nil     }

I've tried all of the above, and I'm getting this error: Pods-{myprojectname}-}frameworks.sh: line 144: ARCHS[@]: unbound variable Command PhaseScriptExecution failed with a nonzero exit code