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Ruby on Rails       Report abuse 

java.lang.NullPointerException
  at org.jboss.tools.common.model.impl.XModelObjectImpl.getChildByPath(XModelObjectImpl.java:332)
  at org.jboss.tools.common.model.filesystems.impl.Libs.updateFileSystems(Libs.java:137)
  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)