The error is thrown because you are passing a string that doesn't correspond with a valid member in your cube.
Note the Query Designer builds a MDX query based on the dimensions and members you select, this query uses the STRTOSET() function to convert your string parameter in a valid member.
...STRTOSET(@CurrentWeekendDate,CONSTRAINED)...If you pass the current weekend date to your parameter it produces:
STRTOSET('2016-01-10',CONSTRAINED)As 2016-01-10 is not a valid member in your Date dimension it throws the error.
You have to pass something like this depending on your cube:
[Date].[Date Key].&[2005-01-01T00:00:00]So in SSRS you have to set your parameter to Text and use this expression:
CORRECT EXPRESSION:
="[200 Date].[Week Ending Date].&["&Format(DateAdd("d",7-DatePart(DateInterval.Weekday,Today,FirstDayOfWeek.Sunday),Today),"yyyy-MM-ddThh:mm:ss")& "]"UPDATE: If [Week Ending date] level doesn't include time:
="[Date].[Date Key].&["&Format(DateAdd("d",7-DatePart(DateInterval.Weekday,Today,FirstDayOfWeek.Sunday),Today),"yyyy-MM-dd")& "]"Go through this tutorial if you get stuck.
Let me know if this helps.