java.lang.NullPointerException
        at org.netbeans.modules.apisupport.project.Util.findSubElements(Util.java:182)
        at org.netbeans.modules.apisupport.project.universe.AbstractEntryWithSources.getRunDependencies(AbstractEntryWithSources.java:134)
        at org.netbeans.modules.apisupport.project.Evaluator.computeRuntimeModuleClasspath(Evaluator.java:672)
        at org.netbeans.modules.apisupport.project.Evaluator.createEvaluator(Evaluator.java:382)
        at org.netbeans.modules.apisupport.project.Evaluator.access$400(Evaluator.java:95)
        at org.netbeans.modules.apisupport.project.Evaluator$2.run(Evaluator.java:231)
        at org.netbeans.modules.apisupport.project.Evaluator$2.run(Evaluator.java:219)
        at org.openide.util.Mutex.readAccess(Mutex.java:327)
        at org.openide.util.Mutex$1R.run(Mutex.java:1299)
        at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1318)
        at org.openide.util.Mutex.readAccess(Mutex.java:275)
        at org.netbeans.modules.apisupport.project.Evaluator.reset(Evaluator.java:218)
        at org.netbeans.modules.apisupport.project.Evaluator.configurationXmlChanged(Evaluator.java:253)
        at org.netbeans.spi.project.support.ant.AntProjectHelper$5.run(AntProjectHelper.java:471)
        at org.netbeans.spi.project.support.ant.AntProjectHelper$5.run(AntProjectHelper.java:467)
        at org.openide.util.Mutex.readAccess(Mutex.java:327)
        at org.openide.util.Mutex$1R.run(Mutex.java:1299)
        at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1318)
        at org.openide.util.Mutex.readAccess(Mutex.java:275)
        at org.netbeans.spi.project.support.ant.AntProjectHelper.fireChange(AntProjectHelper.java:466)
        at org.netbeans.spi.project.support.ant.AntProjectHelper.access$700(AntProjectHelper.java:92)
        at org.netbeans.spi.project.support.ant.AntProjectHelper$3.run(AntProjectHelper.java:429)
        at org.netbeans.spi.project.support.ant.AntProjectHelper$3.run(AntProjectHelper.java:428)
        at org.openide.util.Mutex.readAccess(Mutex.java:327)
        at org.openide.util.Mutex$1R.run(Mutex.java:1299)
        at org.netbeans.api.project.ProjectManager$2$1.run(ProjectManager.java:120)
        at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:120)
        at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:499)
        at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:215)
        at org.netbeans.api.project.ProjectManager$2.execute(ProjectManager.java:118)
        at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1320)
        at org.openide.util.Mutex.readAccess(Mutex.java:275)
        at org.netbeans.spi.project.support.ant.AntProjectHelper$4.run(AntProjectHelper.java:443)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)