? Must declare scalar variable ? on a multi slect

HiI'm not sure what I am doing wrong I have a multi select parameter which work if I only choose one valuebut I get Must declare the scalar variable "@None" when I choose more than onehere is a snipet of my codeALTER PROCEDURE [dbo].[CASELOAD] @Program NVARCHAR (MAX) ,@None VARCHAR (8000)AsSelect....where ...--AND -[b]- Table.Name -- IN (@None)[/b]ThanksJoe