Working with cubes in Ax 2009

hi all

i am working with cubes in ax 2009.

the measures of the cube missing only one measure displayed in the business intelligence development studio

When i try to add the measure it gives me the error message

“Object reference not set to instance of an object.” and i am not able to add any measures to the cube.

I want to add measures to the customer relationship management cube.

Currently it is only showing one measure ‘Master company exchange rate’ Rest of all are missing.

Can any one please help.?