Cannot find type 'MessagingRemoteMessage' in scope

I am trying to get InApp messages using firebase but this error appears every time I write the firebase function.

public func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {
    print("Received data message: \(remoteMessage.appData)")
    if let apsDic = remoteMessage.appData as? [String:Any] {
        EngagementMessage.sharedInstance.presentEngagementCompaign(data: apsDic)
    }
}

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