Expression Tree Tutorial - Knowledge Base (KB)

Lambda compilation throws "variable '' of type '' referenced from scope '', but it is not defined"

When I attempt to compile the lambda shown below, it throws:...variable 'model' of type 'System.Collections.Generic.IEnumerable`1[WheelEndCatalogKendo.Models.SapBasicData]' referenced from scope '', but it is not defined...public static GridBoundColumnBui...