1. Open a CMD with Admin privilege and navigate to \ManageEngine\Opmanager\pgsql\bin\ directory and execute the below command to connect to the database,
psql.exe -U postgres -p 13306 -h 127.0.0.1 OpManagerDB
2. Now execute the below query,
delete from jespaconfiguration;
3. \q to terminate the database.
4. Restart the NetFlow Analyzer Service and try to login using the local Admin account.