Error when creating a calculated member

Hi all i'm trying tio create a simple calculated member, but oncei create the Calculated Member and try to look at it in under the browser tab i'm getting the following values and an associted error message.(#VALUE!)

The Calculation is : SUM([Measures].[ExitCnt]*[Measures].[CancelInd])

Both the ExitCnt and the CancelInd are both of the NUMERIC Data Types. When i move the mouse onto the (#Value!) field i'm gettinng the folowing message,

The  function expects a tuple set expression for the 1 argument. A string or numeric expression was used.
Can anyone please advice me in the right direction?

Thanks