Profile: markm2017

I keep getting the following error message with the check order status plugin.

d:\NEW\Plugins\FoxNetSoft.CheckOrderStatus\Views\CheckOrderStatus\CheckOrder.cshtml(29): error CS1061: 'FoxNetSoft.Plugin.Misc.CheckOrderStatus.Models.CheckOrderModel' does not contain a definition for 'OrderNumber' and no extension method 'OrderNumber' accepting a first argument of type 'FoxNetSoft.Plugin.Misc.CheckOrderStatus.Models.CheckOrderModel' could be found (are you missing a using directive or an assembly reference?)

How can this be fixed?