This issue will occur if you already attempted to migrate your Sqlite database to Maria DB before (upgrading 2.2.1~2 to 2.3) and then you tried to upgrade your database again.
No data is migrated when you upgrade to BioStar 2.3
You will have to manually delete a row and a table in the database.
1. Open your biostar2 database with a database management tool like SQLite Expert.
- database is located in C:\Program Files (x86)\BioStar 2\db
2. Run the query below
DELETE FROM T_SYSCFG WHERE SYSCFGUID = 999999
3. In the same Windows explorer directory, open biostar2.db.log.bk
- change file type to All files
4. Run the query below
DROP TABLE T_SYSCFG_LOG;
5. Upgrade to BioStar 2.3