Deleted reports from http://scomserver/reports after changing database

Hi

After have Upgraded to scom 2012 sp1 ,we encountered  internal error in reporting service with this description :

Incorrect security descriptor version, Microsoft.ReportingServices.Diagnostics.Utilities.InternalCatalogException: An internal error occurred on the report server. See the error log for more details

we found:

https://social.technet.microsoft.com/forums/systemcenter/en-US/37ff1374-c34f-45ff-84a0-f478bfa24d4f/rsinternal-error-while-opneing-reports-in-scom-console

and we done these steps :

1. change reporting database.

2. create new data source :

data source=MyServer;initial catalog=OperationsManagerDW;Integrated Security=SSPI

but I cant find all reports http://scomserver/reports .