When try to access data from SAP in .NET get an error 'Unrecognized message version.'

Question

iam try to access sap soap api from .net but get an error 'Unrecognized message version.' my code

            String endpointurl = "http://link/wsdl/flv_10002A111AD1/bndg_url/sap/bc/srt/rfc/sap/zhr_emp_leave_balance_chk/410/zhr_emp_leave_balance_chk/zhr_emp_leave_balance_chk?sap-client=410";
            BasicHttpBinding binding = new BasicHttpBinding();
            //If you need HTTP with Basic Auth for internal network or dev environments. Otherwise remove these two lines:
            binding.Security.Mode = BasicHttpSecurityMode.TransportCredentialOnly;
            binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;

            EndpointAddress endpoint = new EndpointAddress(endpointurl);
            ZHR_EMP_LEAVE_BALANCE_CHKClient wsclient = new ServiceReference1.ZHR_EMP_LEAVE_BALANCE_CHKClient(binding, endpoint);

            wsclient.ClientCredentials.UserName.UserName = "user";
            wsclient.ClientCredentials.UserName.Password = "password";

            //Here you can use client
            ServiceReference1.ZhrGetEmployeeLeaveWs re = new ZhrGetEmployeeLeaveWs();
            re.IvPernr = "id";

            var request = new ServiceReference1.ZhrGetEmployeeLeaveWsRequest(re);

            var response = await wsclient.ZhrGetEmployeeLeaveWsAsync(re);
            r = response.ZhrGetEmployeeLeaveWsResponse.EsDtls.LeaveBalance.ToString();