org.jvnet.hudson.reactor.ReactorException: java.util.ConcurrentModificationException
	at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:246)
	at hudson.model.Hudson.executeReactor(Hudson.java:683)
	at hudson.model.Hudson.(Hudson.java:601)
	at hudson.model.Hudson.(Hudson.java:541)
	at hudson.WebAppMain$2.run(WebAppMain.java:222)
Caused by: java.util.ConcurrentModificationException
	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
	at java.util.AbstractList$Itr.next(AbstractList.java:343)
	at hudson.PluginManager$1$3$2$1.addTo(PluginManager.java:224)
	at hudson.PluginManager$1$3$2$1.getEdges(PluginManager.java:218)
	at hudson.PluginManager$1$3$2$1.getEdges(PluginManager.java:214)
	at hudson.util.CyclicGraphDetector.visit(CyclicGraphDetector.java:38)
	at hudson.util.CyclicGraphDetector.run(CyclicGraphDetector.java:22)
	at hudson.PluginManager$1$3$2.run(PluginManager.java:214)
	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)
	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
	at hudson.model.Hudson$3.runTask(Hudson.java:665)
	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)
	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)