If you create the SVN logs with the full merge history ("-g" or "--use-merge-history") then StatSvn fails to parse the log file.
The problem seems to be that the full merge history creates nested "logentrry" nodes which contain the history from the merging
e.g.
....
<logentry revision="999">
...
<msg>I merge in my changes from another branch</msg>
<logentry revision="995">
...
<msg>A change I made on the other branch</msg>
</logentry>
<logentry revision="994">
...
<msg>A change I made on the other branch</msg>
</logentry>
</logentry>
As a workaround you can comment out the fatalError(...) in net.sf.statsvn.input.SvnXmlLogFileHandler.checkLastElement(SvnXmlLogFileHandler.java:101).