System.MissingMethodException: Default constructor not found for type System.Xml.Linq.XElement

See more:

MonoForAndroid

Xamarin

I am trying to get the data from my web service.I create a proxy class by using SlSvcUtil , Iam trying to access a method from my proxy class like this

void OnGotResult(object sender, GetChildrenCompletedEventArgs  e)
        {
            resultsLabel.Text = e.Result.ToString();
        }

when i try to access GetChildrenCompletedEventArgs Method in class geneerated from proxy class, it is throwing an Exception with the Message 'Default constructor not found for type System.Xml.Linq.XElement' My code in GetChildrenCompletedEventArgs Method is

[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]
public partial class GetChildrenCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs
{
private object[] results;
public GetChildrenCompletedEventArgs(object[] results, System.Exception exception, bool cancelled, object userState) :
base(exception, cancelled, userState)
{
this.results = results;
}

public System.Xml.Linq.XElement Result
{
    get
    {
        base.RaiseExceptionIfNecessary();
        return ((System.Xml.Linq.XElement)(this.results[0]));
    }
}

And my Stack Trace is :
at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00000] in :0
at System.Activator.CreateInstance (System.Type type) [0x00000] in :0
at System.Runtime.Serialization.XmlSerializableMap.DeserializeObject (System.Xml.XmlReader reader, System.Runtime.Serialization.XmlFormatterDeserializer deserializer) [0x00000] in :0
at System.Runtime.Serialization.XmlFormatterDeserializer.DeserializeByMap (System.Xml.XmlQualifiedName name, System.Type type, System.Xml.XmlReader reader) [0x00000] in :0
at System.Runtime.Serialization.XmlFormatterDeserializer.Deserialize (System.Type type, System.Xml.XmlReader reader) [0x00000] in :0
at System.Runtime.Serialization.SerializationMap.DeserializeContent (System.Xml.XmlReader reader, System.Runtime.Serialization.XmlFormatterDeserializer deserializer, System.String id, Boolean empty) [0x00000] in :0
at System.Runtime.Serialization.SerializationMap.DeserializeContent (System.Xml.XmlReader reader, System.Runtime.Serialization.XmlFormatterDeserializer deserializer, System.String id) [0x00000] in :0
at System.Runtime.Serialization.SerializationMap.DeserializeObject (System.Xml.XmlReader reader, System.Runtime.Serialization.XmlFormatterDeserializer deserializer) [0x00000] in :0
at System.Runtime.Serialization.XmlFormatterDeserializer.DeserializeByMap (System.Xml.XmlQualifiedName name, System.Type type, System.Xml.XmlReader reader) [0x00000] in :0
at System.Runtime.Serialization.XmlFormatterDeserializer.Deserialize (System.Type type, System.Xml.XmlReader reader) [0x00000] in :0
at System.Runtime.Serialization.XmlFormatterDeserializer.Deserialize (System.Xml.XmlReader reader, System.Type declaredType, System.Runtime.Serialization.KnownTypeCollection knownTypes, IDataContractSurrogate surrogate, System.Runtime.Serialization.DataContractResolver resolver, System.Runtime.Serialization.DataContractResolver defaultResolver, System.String name, System.String ns, Boolean verifyObjectName) [0x00000] in :0
at System.Runtime.Serialization.DataContractSerializer.ReadObject (System.Xml.XmlDictionaryReader reader, Boolean verifyObjectName) [0x00000] in :0
at System.Runtime.Serialization.XmlObjectSerializer.ReadObject (System.Xml.XmlDictionaryReader reader) [0x00000] in :0
at System.ServiceModel.Dispatcher.DataContractMessagesFormatter.ReadMessagePart (System.ServiceModel.Description.MessagePartDescription part, System.Xml.XmlDictionaryReader r) [0x00000] in :0
at System.ServiceModel.Dispatcher.DataContractMessagesFormatter.MessageToParts (System.ServiceModel.Description.MessageDescription md, System.ServiceModel.Channels.Message message) [0x00000] in :0
at System.ServiceModel.Dispatcher.BaseMessagesFormatter.DeserializeReply (System.ServiceModel.Channels.Message message, System.Object[] parameters) [0x00000] in :0
at System.ServiceModel.Dispatcher.OperationFormatter.DeserializeReply (System.ServiceModel.Channels.Message message, System.Object[] parameters) [0x00000] in :0
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Request (System.ServiceModel.Description.OperationDescription od, System.Object[] parameters) [0x00000] in :0
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.DoProcess (System.Reflection.MethodBase method, System.String operationName, System.Object[] parameters) [0x00000] in :0
at System.ServiceModel.MonoInternal.ClientRuntimeChannel.Process (System.Reflection.MethodBase method, System.String operationName, System.Object[] parameters) [0x00000] in :0

Help me solving this issue.