This is what i found in the .log:
!ENTRY net.sourceforge.metrics 4 4 2008-01-21 22:25:13.887
!MESSAGE CompilationUnitMetrics::addInnerClasses
!STACK 0
java.lang.ArrayIndexOutOfBoundsException: 0
at net.sourceforge.metrics.core.sources.CompilationUnitMetrics.addInnerClasses(CompilationUnitMetrics.java:100)
at net.sourceforge.metrics.core.sources.CompilationUnitMetrics.initializeChildren(CompilationUnitMetrics.java:88)
at net.sourceforge.metrics.core.sources.AbstractMetricSource.recurse(AbstractMetricSource.java:297)
at net.sourceforge.metrics.core.sources.Dispatcher.calculateAbstractMetricSource(Dispatcher.java:109)
at net.sourceforge.metrics.builder.MetricsBuilder$ChangedCommand.execute(MetricsBuilder.java:509)
at net.sourceforge.metrics.builder.MetricsBuilder$CalculatorThread.run(MetricsBuilder.java:713)