Attached database failed for sever "blah". (Microsoft.SqlServer.Smo)

=================================== Attach database failed for Server 'DENR-HP'.  (Microsoft.SqlServer.Smo) ------------------------------ For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=10.50.1600.1+((KJ_RTM).100402-1539+)&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Attach+database+Server&LinkId=20476 ------------------------------ Program Location:    at Microsoft.SqlServer.Management.Smo.Server.AttachDatabase(String name, StringCollection files)    at Microsoft.SqlServer.Management.SqlManagerUI.AttachDatabaseData.PrimaryFile.Attach()    at Microsoft.SqlServer.Management.SqlManagerUI.AttachDatabase.SendDataToServer() =================================== An exception occurred while executing a Transact-SQL statement or batc ...