When we have upgraded the h2 library we get following error trying to open 
the existing databases:

*Unsupported database file version or invalid file header in file 
"/path/to/database.h2.mv.db" [90048-220] 90048/90048*

We use a file based database ("jdbc:h2:file:...")

Creating new databases works well.

Has something changed so the files are not compatible?
Any way to get around this in an easy way? The upgrade from version 1 was a 
hassle for us earlier and we really wish not to do that again.
Is there any way to get more information about why it gets this error?

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