Adding App Events in iOS app produces undeclared identifier 'AppEvent'

I am trying to add facebook app events, and I installed FacebookSDK. Then I have next code:

import FacebookCore

static func logViewContentEvent(contentType : String, contentData : String, contentId : String, currency : String, price : Double) {
        let params : AppEvent.ParametersDictionary = [
            .contentType : contentType,
            .content : contentData,
            .contentId : contentId,
            .currency : currency
        ]
        let event = AppEvent(name: .viewedContent, parameters: params, valueToSum: price)
        AppEventsLogger.log(event)
    }

But I get error from the title. What I am doing wrong, and why this type is missing?

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