[libreoffice-users] No longer able to open a ODB file

When I try to open this file: http://db.tt/CN65sXtn
I am presented with the Filter Selection dialog, from which I choose ODF 
database.
I next get a 'General Error'.
Clicking on 'Tables' gives:
    The connection to the data source "Books' could not be established.
    The driver class " could not be loaded.
Clicking More gives three errors
The connection to the data source "Books' could not be established.
    Error code: 1000  The driver class '' could not be loaded.
    SQL Status: HY000   The driver class '' could not be loaded.

and the file remains inaccessible.

One day the file worked and saved without problem. The next day it does 
not open on any machine.

A similar database opens without problem.

Is there a way to recover this file?



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