NullPointerException occures while running JstJspAllTests

!ENTRY org.eclipse.core.jobs 4 2 2009-12-30 18:45:37.984
!MESSAGE An internal error occurred during: "JBoss Tools Model Update".
!STACK 0
java.lang.NullPointerException
at org.jboss.tools.jst.web.model.helpers.InnerModelHelper.createXModel(InnerModelHelper.java:39)
at org.jboss.tools.jst.web.kb.internal.scanner.ClassPathMonitor.init(ClassPathMonitor.java:56)
at org.jboss.tools.jst.web.kb.internal.KbProject.setProject(KbProject.java:140)
at org.jboss.tools.jst.web.kb.KbProjectFactory$1.run(KbProjectFactory.java:99)
at org.jboss.tools.common.model.XJob.runInWorkspace(XJob.java:158)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)