An internal error occurred during: "JBoss Tools Model Update".

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
	at java.util.HashMap$KeyIterator.next(HashMap.java:828)
	at java.util.AbstractCollection.addAll(AbstractCollection.java:305)
	at java.util.HashSet.<init>(HashSet.java:100)
	at org.jboss.tools.common.model.filesystems.impl.LibraryNames.getPaths(Libs.java:294)
	at org.jboss.tools.common.model.filesystems.impl.Libs.updateFileSystems(Libs.java:133)
	at org.jboss.tools.common.model.filesystems.impl.Libs.update(Libs.java:92)
	at org.jboss.tools.common.model.project.ext.AbstractClassPathMonitor.update(AbstractClassPathMonitor.java:63)
	at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor$1.run(ClassPathMonitor.java:186)
	at org.jboss.tools.common.model.XJob.runInWorkspace(XJob.java:178)
	at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)