Year to Date Totals with MDX in Analysis Services.

I have a simple demonstration cube with one dimension, a time dimension with levels date, month, quarter and year,   and a measure [ACCOUNT BALANCE].

I'm trying to compute Year to date totals for [ACCOUNT BALANCE].
To do this I created a calculated measure called [YTD ACCOUNT BALANCE]

WITH MEMBER Measures.[YTD ACCOUNT BALANCE] AS SUM (YTD([TIME].[DATE].CurrentMember),[Measures].[ACCOUNT BALANCE])
SELECT    NON EMPTY({[Measures].[ACCOUNT BALANCE], Measures.[YTD ACCOUNT BALANCE] } )ON COLUMNS
,[Time].[Date].&[2005-12-06T00:00:00]:[Time].[Date].&[2006-02-26T00:00:00] on Rows
from [BalanceData]

This query generates an error.  The error says,

By default a year level was expected. No such level was found in the cube.

See attached image.