Issue with sending email

Server stack trace: at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc) at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout) at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation) at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at Microsoft.Xrm.Sdk.IOrganizationService.Retrieve(String entityName, Guid id, ColumnSet columnSet) at Microsoft.Xrm.Sdk.Client.OrganizationServiceProxy.RetrieveCore(String entityName, Guid id, ColumnSet columnSet) at ClickDimensions.Crm.MsCrm2011.Common.CrmOrganizationProxyAdapter.Retrieve(String entityName, Guid id, ColumnSet columnSet) in D:\WF01\64\s\Platform\MsCrm\v2011\ClickDimensions.Crm.MsCrm2011\Common\CrmOrganizationProxyAdapter.cs:line 324 at ClickDimensions.Crm.MsCrm2011.MsCrm2011Email.GetPerformSplitTest(String emailSendId) in D:\WF01\64\s\Platform\MsCrm\v2011\ClickDimensions.Crm.MsCrm2011\Email\MsCrm2011Email.cs:line 1755 at ClickDimensions.Web.MSCRM.V4.pages.EmailSend.btnPageLoad_Click(Object sender, EventArgs e) in D:\WF01\64\s\Web\ClickDimensions.Web\MSCRM\pages\EmailSend.aspx.cs:line 111