In case your Geutebrück Server shows database error after hardware change of your DB harddrives:
go to
[HKEY_LOCAL_MACHINE\SOFTWARE\Geutebrueck\Gng\Server\DBE]
and delete this entry.
restart G-Core Server
[HKEY_LOCAL_MACHINE\SOFTWARE\Geutebrueck\Gng\Server\DBE]
and delete this entry.
restart G-Core Server