That error means that the Sony driver is having problems opening the database on the device. You need to check that the device is connected and seen in Explorer and that the database is seen. The database is called "books.db" and is in the directory "Sony_Reader/database" in the device. Also make sure that the device hasn't been mounted read-only.
The timing for this report is disturbing as I had just responded to a
similar error for a Kobo device. They are effectively the same error, with the difference in the error message because the Kobo driver uses apsw to read the SQLite database and the Sony driver uses sqlite3. As there are issues with the Win10 preview, I'm worried that MS has sent out an update that has broken access to these devices. Hopefully it's just a coincidence and me being paranoid.