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iOS

Cannot figure out why I am getting the error "PFPush does not have a member named sendPushInBackground"

I copied this from the parse documentation and I keep getting this error. I am not sure why

            let pushQuery = PFInstallation.query()
            pushQuery.whereKey("deviceType", equalTo: "ios")

            let push = PFPush()
            push.setQuery(pushQuery) // Set our Installation query
            push.setMessage("Willie Hayes injured by own pop fly.")
            push.sendPushInBackground()