I have the same problem using sonic stage v1.5.
Yesterday I uninstalled sonic stage v1.5, and deleted 'Program FilesAll UsersApplication DataSony Corporation' 'Program FilesCommon FilesSony Shared' and 'Program FilesSony' .
I also deleted 'HKEY_CURRENT_USERSoftwareSony Corporation' and 'HKEY_LOCAL_MACHINESoftwareSony Corporation' ....restared my PC and installed Sonic Stage 2.0.........
but I have still the same database error