[Error] You've implemented -[<UIApplicationDelegate> application:didReceiveRemoteNotification:fetchCompletionHandler:], but you still need to add "remote-notification" to the list of your supported UIBackgroundModes in your Info.plist.

info.plist 에 UIBackgroundModes, remote-notification 항목을 추가한다.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>UIBackgroundModes</key>
	<array>
		<string>remote-notification</string>
	</array>

또는 아래와 같이 Remote notifications 를 체크한다.