Installed Version 2.9.0-beta-2222 But occured another Exception at same line Invalid or unknown command response received. GenericNack, Status: ESME_ROK, Sequence IList<SubmitMultiResp> resp = await _client.SubmitAsync(SMS.ForSubmitMulti() .ServiceType("") .Text("Multi Message") .From(sourceAddress)...

Single message sent successfully . For multi message below exception is occured. Unable to cast object of type 'Inetlab.SMPP.PDU.GenericNack' to type 'Inetlab.SMPP.PDU.SubmitMultiResp'. at await _client.SubmitAsync List<IAddress> destList = new List<IAddress>(); destList.Add(new SmeAddress("12345678...