let request = PayReq()
        request.partnerId = "10000100"
        request.prepayId = "1101000000140415649af9fc314aa427"
        request.package = "Sign=WXPay"
        request.nonceStr = "a462b76e7436e98e0ed6e13c64b4fd1c"
        request.timeStamp = 1397527777
        request.sign = "582282D72DD2B03AD892830965F428CB16E7A256"
        WXApi.send(request) { isSuccess in
            print("支付请求发送：\(isSuccess)")
        }

程序崩溃

+[WXApi genExtraUrlByReq:withAppData:]: unrecognized selector sent to class 0x1004d84a8