An Error Has Occured

System.FormatException: Unrecognized Guid format. at System.Guid.GuidResult.SetFailure(ParseFailureKind failure, String failureMessageID, Object failureMessageFormatArgument, String failureArgumentName, Exception innerException) at System.Guid.TryParseGuid(String g, GuidStyles flags, GuidResult& result) at System.Guid.Parse(String input) at IBSCustom.CombinedWorkflow.MVCWidgets.InventoryWidgets.InventoryDetailsDirectorController.Index() in E:\iBeanz\Alteso\BitBucket\IBS.V.2\IBSCustom.CombinedWorkflow\MVCWidgets\InventoryWidgets\InventoryDetailsDirectorController.cs:line 32