What steps will reproduce the problem? 1. svn up && ant (aka, compile from trunk) 2. go through BEAUti and select the skygrid coalescent prior 3. If you try to run the generated XML you'll get something like: " Exactly one ELEMENT of type CoalescentIntervalProvider REQUIRED at dr.xml.AbstractXMLObjectParser.parseXMLObject(Unknown Source) at dr.xml.XMLParser.convert(Unknown Source) at dr.xml.XMLParser.convert(Unknown Source) at dr.xml.XMLParser.convert(Unknown Source) at dr.xml.XMLParser.convert(Unknown Source) at dr.xml.XMLParser.parse(Unknown Source) at dr.app.beast.BeastMain.<init>(Unknown Source) at dr.app.beast.BeastMain.main(Unknown Source) Apr 03, 2015 3:16:04 PM dr.app.beast.BeastMain <init> SEVERE: Parsing error - poorly formed BEAST file, Dengue4.env_testskygrid.xml: The '<coalescentEventsStatistic>' element with id, 'null', is incorrectly constructed. The following was expected: Exactly one ELEMENT of type CoalescentIntervalProvider REQUIRED java.lang.RuntimeException: Terminate at dr.app.beast.BeastMain.<init>(Unknown Source) at dr.app.beast.BeastMain.main(Unknown Source) " The reason seems to be an empty block: <coalescentEventsStatistic> </coalescentEventsStatistic>

that is created and inserted in the log block.