-24990: ERR_ NOBACKUPSESSION - no backup session available 

Explanation:

The DBM server command is only permitted if the Save or Restore is active.

User action:

First of all, start the backup session you require using the DBM server command backup_save or backup_restore , and execute further commands depending on how the Save/Restore runs.

Check whether the Save/Restore started properly.

Please note that importing a database backup using Restore will override the current status of your database.

If the error occurs in the Database Manager GUI and there is no way in which you can correct it, please contact your local support organization.