Don`t Have Permissionn To See This Data

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SQL

SQL-Server

reporting

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Hi
I am using Sharepoint 2010 Service and I am trying to create a new Performance Point Dashboard, therefore I created a new Data Connection, and I could connect to the Analysis Services and Browse to the cube, but when I try to select Time Dimension in the tab Time after a while it shows an error..

Error running data source query. Contact the administrator for more details and the Measures or Dimensions show this error: You do not have permissions to see this data. Additional details have been logged for your administrator

It only occurs when i select "Servera1" it show the above error but if i select "serverb2" it works fine and do all job as i need just a problem in selecting "serverb2" the data is much lesser than servera1 have.

I am the Sharepoint Administrator and have full rights to the Analysis Server cube

Thanks!
M Ahsan