SvnStat

When trying SvnStat with any of my SVN repositories, I get this exception:

java.lang.NullPointerException
at de.agentlab.svnstat.SvnStat.readXml(SvnStat.java:143)
at de.agentlab.svnstat.SvnStat.run(SvnStat.java:86)
at de.agentlab.svnstat.SvnStat.main(SvnStat.java:257)
org.jCharts.properties.PropertyException: The Axis Increment can not be a
negative value or zero.
at org.jCharts.properties.DataAxisProperties.setUserDefinedScale(Unknown
Source)
at de.agentlab.svnstat.Graph.lineChart(Graph.java:122)
at de.agentlab.svnstat.Stat.fileCount(Stat.java:433)
at de.agentlab.svnstat.SvnStat.run(SvnStat.java:93)
at de.agentlab.svnstat.SvnStat.main(SvnStat.java:257)


Log files are correct and work with other stats generator, as I am
evaluatin several.

Any clues?

Thank you in advance! :)