Troubleshoot: The given key was not present in the dictionary

Problem:

The given key was not present in the dictionary. actualll i want to add webservice to my XAML page then that error occur .. exception snap shot : {System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary. at System.ThrowHelper.ThrowKeyNotFoundException() at System.Collections.Generic.Dictionary`2.get_Item(TKey key) at System.ServiceModel.Configuration.ServiceModelSectionGroup.get_Client() at System.ServiceModel.Description.ConfigLoader.LookupChannel(String configurationName, String contractName, Boolean wildcard) at System.ServiceModel.Description.ConfigLoader.LoadChannelBehaviors(ServiceEndpoint serviceEndpoint, String configurationName) at System.ServiceModel.ChannelFactory.ApplyConfiguration(String configurationName) at System.ServiceModel.ChannelFactory.InitializeEndpoint(String configurationName, EndpointAddress address) at System.ServiceModel.ChannelFactory`1..ctor(String endpointConfigurationName, EndpointAddress remoteAddress) at System.ServiceModel.ChannelFactory`1..ctor(String endpointConfigurationName) at System.ServiceModel.EndpointTrait`1.CreateSimplexFactory() at System.ServiceModel.EndpointTrait`1.CreateChannelFactory() at System.ServiceModel.ClientBase`1.CreateChannelFactoryRef(EndpointTrait`1 endpointTrait) at System.ServiceModel.ClientBase`1.InitializeChannelFactoryRef() at System.ServiceModel.ClientBase`1..ctor() at PLO.ClientWCF.ClientWCFClient..ctor() at PLO.ClientMaster..ctor() at PLO.Login.clientImage_MouseLeftButtonDown(Object sender, MouseEventArgs e) at System.Windows.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args) at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)} what to do... thanx in advance

 

Solution:

To work around this issue for now, uninstall the Silverlight 2 SDK, update your service reference, and rebuild your Silverlight application.

If you want your service to be consumable by both Silverlight 2 and Silverlight 3 applications, you can change the binding back to basicHttpBinding.  To do that, edit the web.config file for the web project containing the service.  Then update the service reference and rebuild your Silverlight application.

 

More detail:

http://blogs.msdn.com/jamlew/archive/2009/03/18/silverlight-3-tools-issue-new-wcf-template-is-broken-by-silverlight-2-sdk.aspx