Source: - The given key was not present in the dictionary. at Client.scComboBox.SetSelectedKey(String pKey, Boolean pFireEventIfKeyIsChanged) at Client.PM_Email_Scheduler.LoadForm() at Client.PM_Email_Scheduler_Controller.run() at Client.CnAdminMenu.btnSchEmail_Click(Object sender, EventArgs e) An error occurred opening the Performance Measure Email Scheduler.