OpManager restore DB

Hi all,

I have some question about OpManager restore process.

my OpManager version: 7020
Than I backed up the data from this OpManager (7020).
I restored DB in other server. But It couldn't restore every server.
When I entered the restored DB, there is appeared following error message:
Status Message
Unable to fetch Managed Object details for the object : x.x.x.x

How to fix that ?

Thank you.