That means that some of the history files are missing -- See #3.2 

There is also a message: cant dbminit ME (Math) argument out of domain of func
This means that your history.dir file is not formatted correctly. It should 
look something like this: (from James Brister)

dbz 3 2579 9 C 128 127 24 4 3 2 1 0
4677 1706 1706 0 0 0 0 0 0 0 0

(i.e. two lines of ascii, most of it being numbers).

In the latter case you can do:

cd /where/the/history/is
rm history.dir
rm history.pag
makehistory -r -f history

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