There is no current database backup. This log backup cannot be used to roll forward a preceding database backup.
To restore the database after failure, you must begin either with a full database backup, or with a partial or complete set of file backups. Either this database has never been backed up or a BACKUP LOG statement was executed after an ALTER DATABASE statement, which added or removed one or more files, was performed. Therefore, the log backup just completed is not useful.
Perform a full database backup before backing up the log.
| BACKUP | Errors 4000-4999 |
| Backing Up and Restoring Databases | Troubleshooting Backing Up and Restoring |