Hi Jeremy, I'm seeing the following error when I'm running off an EVIO file (hps _004889.evio.0 in this case): Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException Exception in thread "AWT-EventQueue-0" java.util. ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901) at java.util.ArrayList$Itr.next(ArrayList.java:851) at hep.aida.jfree.renderer.MultiGradientScale.getColor(MultiGradientScale .java:52) at hep.aida.jfree.renderer.MultiGradientScale.getColor(MultiGradientScale .java:13) at hep.aida.jfree.renderer.AbstractPaintScale.getPaint(AbstractPaintScale .java:62) at hep.aida.jfree.renderer.XYVariableBinWidthBlockRenderer.drawItem( XYVariableBinWidthBlockRenderer.java:78) at org.jfree.chart.plot.XYPlot.render(XYPlot.java:3738) at org.jfree.chart.plot.XYPlot.draw(XYPlot.java:3271) at org.jfree.chart.JFreeChart.draw(JFreeChart.java:1229) at org.jfree.chart.ChartPanel.paintComponent(ChartPanel.java:1624) at javax.swing.JComponent.paint(JComponent.java:1053) at javax.swing.JComponent.paintToOffscreen(JComponent.java:5223) at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered( RepaintManager.java:1572) at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1495) at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager .java:306) at javax.swing.RepaintManager.paint(RepaintManager.java:1265) at javax.swing.JComponent._paintImmediately(JComponent.java:5171) at javax.swing.JComponent.paintImmediately(JComponent.java:4982) at javax.swing.RepaintManager$4.run(RepaintManager.java:824) at javax.swing.RepaintManager$4.run(RepaintManager.java:807) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain .java:75) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:807) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:782) at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:731) at javax.swing.RepaintManager.access$1300(RepaintManager.java:64) at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager .java:1720) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744) at java.awt.EventQueue.access$400(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:697) at java.awt.EventQueue$3.run(EventQueue.java:691) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain .java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:714) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread .java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread .java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread .java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException I'm also seeing the following warning: Wed Apr 22 14:29:35 PDT 2015 org.hps.evio.LCSimTestRunEventBuilder getEventData WARNING: Readout status is usually 0; got -67633145 Any idea what these are all about? The first error has something to do with JFree chart so I don't think it's due to running over an EVIO file but the second does. They aren't causing the run to crash, but the are consistently popping up so I thought I would report them. I'm see them no matter what steering file I use. I'm using the following command run to over the file: java -cp hps-java-jar org.hps.evio.EvioToLcio -d detector -x steering_file. lcsim file.evio --Omar Moreno ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1