Unable to sort because the IComparer.Compare() method returns inconsistent results (4376919)

Unable to sort because the IComparer.Compare() method returns inconsistent results

The following error message is displayed when trying to open the Forest Recovery console.<p><img src="" /><

Unable to sort because the IComparer.Compare() method returns inconsistent results. Either a value does not compare equal to itself, or one value repeatedly compared to another value yields different results.
ICompare:
'QuestSoftware.RecoveryManager.AD.ForestRecovery.BusinessLogic.BackupDateComparer'.