Error while compiling: BGrade.cs(204,41): error CS1061: Type `ConstructionGrade' does not contain a definition for `costToBuild' and no extension method `costToBuild' of type `ConstructionGrade' could be found. Are you missing an assembly reference?

can anyone help with his question i have the same issue 

Change line 202 from

                    costToBuild = grade.CostToBuild();​

                    costToBuild = grade.costToBuild;​

what, no. that's backwards. just make sure you are using the latest version of the plugin, it's fixed now.

Ah thanks, I was compiling against an old set of libs.