Hei Vishnu
I found the solution of my problem!
And discovered a new one...
Solution to my problem:
The error appears cause of a corrupt local.cdb file.
This file handles the local configuration.
Usually this file is 70kb or bigger... Mine was 600bytes.
So i copied another file (from another backup user) to my "user database Folder" and now it seems to work.
To my new problem:
Why does the ARCserve Backup Server creates corrupt or incomplete configuration files?
Best Regards Tim