(Note: Backup/Restore can be done on the Server Computer only so make sure that Backup / Restore Utility is installed on SOUL Server Computer only)
In case SOUL Server generates Handshake Key or ask Activation Key again and that key has '@' symbol in it then this key is not proper and SOUL Server has been started more than once.
The particular error is occuring because the Database for SOUL has not been created properly. Please create the database from Installer or import the existing one.