Untitled

How can I solve this MDX Problem?

"The CURRENTMEMBER function expects a hierarchy expression for the 1 argument."

       

with member [Measures].[Growth] as ([Date].[Calendar].[Month].CurrentMember,[Measures].[Internet Sales Amount])-([Date].[Calendar].[Month].CurrentMember.PrevMember,[Measures].[Internet Sales Amount])

select

{[Measures].[Internet Sales Amount],[Measures].[Growth] }

on columns,

{([Date].[Calendar].[Month].Members)}

on rows

FROM [Adventure Works]

       

with member [Measures].[Growth] as ([Date].[Calendar].CurrentMember,[Measures].[Internet   Sales Amount])-([Date].[Calendar].CurrentMember.PrevMember,[Measures].[Internet Sales Amount])