"The empty string '' is not a valid local name." - Xamarin Android WCF Service call error

Hi Guys,

I am getting following error while calling WCF Service (Xamarin Android)
Which works fine for windows mobile phone.

**"The empty string '' is not a valid local name." **

at (wrapper managed-to-native) System.Object:__icall_wrapper_mono_delegate_end_invoke (object,intptr)
at (wrapper delegate-end-invoke) :end_invoke_object__this___object[]&_IAsyncResult (object[]&,System.IAsyncResult)
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.EndProcess (System.Reflection.MethodBase method, System.String operationName, System.Object[] parameters, IAsyncResult result) [0x00025] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/mcs/class/System.ServiceModel/System.ServiceModel/ClientRuntimeChannel.cs:460
at System.ServiceModel.ClientBase1+ChannelBase1[TChannel,T].EndInvoke (System.String methodName, System.Object[] args, IAsyncResult result) [0x0003c] in /Users/builder/data/lanes/2098/3efa14c4/source/mono/mcs/class/System.ServiceModel/System.ServiceModel/ClientBase.cs:404

on another pc I am getting following error for same web service call.

System.Net.WebException: There was an error on processing web request: Status code 400(BadRequest): Bad Request

at System.ServiceModel.Channels.HttpRequestChannel+HttpChannelRequestAsyncResult.WaitEnd () [0x00034] in /Users/builder/data/lanes/2185/53fce373/source/mono/mcs/class/System.ServiceModel/System.ServiceModel.Channels/HttpRequestChannel.cs:494
at System.ServiceModel.Channels.HttpRequestChannel.EndRequest (IAsyncResult result) [0x00029] in /Users/builder/data/lanes/2185/53fce373/source/mono/mcs/class/System.ServiceModel/System.ServiceModel.Channels/HttpRequestChannel.cs:349
at System.ServiceModel.Channels.HttpRequestChannel.Request (System.ServiceModel.Channels.Message message, TimeSpan timeout) [0x00000] in /Users/builder/data/lanes/2185/53fce373/source/mono/mcs/class/System.ServiceModel/System.ServiceModel.Channels/HttpRequestChannel.cs:72
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Request (System.ServiceModel.Channels.Message msg, TimeSpan timeout) [0x0000b] in /Users/builder/data/lanes/2185/53fce373/source/mono/mcs/class/System.ServiceModel/System.ServiceModel/ClientRuntimeChannel.cs:584
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Request (System.ServiceModel.Description.OperationDescription od, Boolean isAsync, System.Object[]& parameters, System.ServiceModel.OperationContext context) [0x00069] in /Users/builder/data/lanes/2185/53fce373/source/mono/mcs/class/System.ServiceModel/System.ServiceModel/ClientRuntimeChannel.cs:536
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.DoProcess (System.Reflection.MethodBase method, System.String operationName, Boolean isAsync, System.Object[]& parameters, System.ServiceModel.OperationContext context) [0x0003a] in /Users/builder/data/lanes/2185/53fce373/source/mono/mcs/class/System.ServiceModel/System.ServiceModel/ClientRuntimeChannel.cs:501
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Process (System.Reflection.MethodBase method, System.String operationName, Boolean isAsync, System.Object[]& parameters, System.ServiceModel.OperationContext context) [0x0000d] in /Users/builder/data/lanes/2185/53fce373/source/mono/mcs/class/System.ServiceModel/System.ServiceModel/ClientRuntimeChannel.cs:482 }

Thanks
Yog