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I am working in SharePoint 2013, I received errors while I was working on Advance look up.

Two errors one after the other:

System.InvalidOperationException: Sequence contains no matching element

at System.Linq.Enumerable.First[TSource](IEnumerable1 source, Func2 predicate)

at AnjLab.SharePoint.RichControls.Fields.RichLookupField.DependedLookUp()

at AnjLab.SharePoint.RichControls.Fields.RichLookupField.Update()

at Microsoft.SharePoint.ApplicationPages.FieldEditPage.BtnOk_Click(Object sender, EventArgs e)

at System.Web.UI.WebControls.Button.OnClick(EventArgs e)

at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)

at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Getting Error Message for Exception System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.InvalidOperationException: Sequence contains no matching element

at System.Linq.Enumerable.First[TSource](IEnumerable1 source, Func2 predicate)

at AnjLab.SharePoint.RichControls.Fields.RichLookupField.DependedLookUp()

at AnjLab.SharePoint.RichControls.Fields.RichLookupField.Update()

at Microsoft.SharePoint.ApplicationPages.FieldEditPage.BtnOk_Click(Object sender, EventArgs e)

at System.Web.UI.WebControls.Button.OnClick(EventArgs e)

at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)

at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

at System.Web.UI.Page.HandleError(Exception e)

at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

at System.Web.UI.Page.ProcessRequest()

at System.Web.UI.Page.ProcessRequest(HttpContext context)

at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

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