App crashes Springboard when IntentHandler embedded

Code Block //
//  IntentHandler.swift
//  SiriExtension
import Intents
class IntentHandler: INExtension, INSendMessageIntentHandling, INSearchForMessagesIntentHandling {
    override func handler(for intent: INIntent) -> Any {
        // This is the default implementation.  If you want different objects to handle different intents,
        // you can override this and return the handler you want for that particular intent.
        switch intent {
        case is AddAttendeeIntent:
            return AddAttendeeIntentHandler()
        case is RemoveAttendeeIntent:
            return RemoveAttendeeIntentHandler()
        case is StartMeetingIntent:
            return StartMeetingIntentHandler()
        case is EndMeetingIntent:
            return EndMeetingIntent()
        case is ResetMeetingIntent:
            return ResetMeetingIntent()
        case is QuorumReachedIntent:
            return QuorumReachedIntent()
        default:
            fatalError("No handler for this intent")
        }
    }
    func resolveRecipients(for intent: INSendMessageIntent, with completion: @escaping ([INSendMessageRecipientResolutionResult]) -> Void) {
        if let recipients = intent.recipients {
            // If no recipients were provided we'll need to prompt for a value.
            if recipients.count == 0 {
   completion([INSendMessageRecipientResolutionResult.needsValue()])
                return
            }
            var resolutionResults = [INSendMessageRecipientResolutionResult]()
            for recipient in recipients {
                let matchingContacts = [recipient] // Implement your contact matching logic here to create an array of matching contacts
                switch matchingContacts.count {
                case 2  ... Int.max:
                    // We need Siri's help to ask user to pick one from the matches.
                    resolutionResults += [INSendMessageRecipientResolutionResult.disambiguation(with: matchingContacts)]
                case 1:
                    // We have exactly one matching contact
                    resolutionResults += [INSendMessageRecipientResolutionResult.success(with: recipient)]
                case 0:
                    // We have no contacts matching the description provided
                    resolutionResults += [INSendMessageRecipientResolutionResult.unsupported()]
                default:
                    break
                }
            }
            completion(resolutionResults)
        }
    }
    func resolveContent(for intent: INSendMessageIntent, with completion: @escaping (INStringResolutionResult) -> Void) {
        if let text = intent.content, !text.isEmpty {
            completion(INStringResolutionResult.success(with: text))
        } else {
            completion(INStringResolutionResult.needsValue())
        }
    }
    // Once resolution is completed, perform validation on the intent and provide confirmation (optional).
    func confirm(intent: INSendMessageIntent, completion: @escaping (INSendMessageIntentResponse) -> Void) {
        // Verify user is authenticated and your app is ready to send a message.
        let userActivity = NSUserActivity(activityType: NSStringFromClass(INSendMessageIntent.self))
        let response = INSendMessageIntentResponse(code: .ready, userActivity: userActivity)
        completion(response)
    }
    // Handle the completed intent (required).
    func handle(intent: INSendMessageIntent, completion: @escaping (INSendMessageIntentResponse) -> Void) {
        // Implement your application logic to send a message here.
        let userActivity = NSUserActivity(activityType: NSStringFromClass(INSendMessageIntent.self))
        let response = INSendMessageIntentResponse(code: .success, userActivity: userActivity)
        completion(response)
    }
    
    // MARK: - INSearchForMessagesIntentHandling
    func handle(intent: INSearchForMessagesIntent, completion: @escaping (INSearchForMessagesIntentResponse) -> Void) {
        // Return success to launch your Watch application with userActivity containing information for the message search on the interaction.
        let userActivity = NSUserActivity(activityType: NSStringFromClass(INSearchForMessagesIntent.self))
        let response = INSearchForMessagesIntentResponse(code: .success, userActivity: userActivity)
        completion(response)
    }
}