error:failed retrieve data for this request

I need to attach my database to SQL server 2008(I used it before without problem),but now when I want to attach db , sqlsrv sent me this error.

error:failed retrieve data for this request.开发者_高级运维

Why do I have this problem and how can I solve it?

Please make sure that the SQL Server Service account has modify permissions over the physical mdf and ldf file on the hard drive that you are trying to attach to a SQL Server instance, and modify permissions also over the folder that contains the file