error during export from ESB and IB

hello,

I'm working with a new project with SAp PI 7.3.

when we try to export objects from ESB or IB we have this error:

Export failed: Internal error during pvc call: Getting an instance of com.tssap.dtr.pvc.util.sql.GenericSQLClassFactory is not allowed because the DB platform is not yet initialized. Make sure that the initialize method is called before getting an instalce of this class.
See error logs for details

We tried to restart systems without success.

Any suggestions?

thanks

Alex