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java.lang.NullPointerException: 	at java.util.Vector.addAll(Unknown Source)	at hudson.model.AbstractProject.getActions(AbstractProject.java:1110)	at hudson.model.Actionable.getActions(Actionable.java:88)	at hudson.plugins.jobConfigHistory.JobConfigHistoryActionFactory.createFor(JobConfigHistoryActionFactory.java:30)	at hudson.model.AbstractProject.createTransientActions(AbstractProject.java:698)	at hudson.model.Project.createTransientActions(Project.java:206)	at hudson.model.AbstractProject.updateTransientActions(AbstractProject.java:688)	at hudson.model.AbstractProject.save(AbstractProject.java:266)	at hudson.model.Job.onLoad(Job.java:192)	at hudson.model.AbstractProject.onLoad(AbstractProject.java:278)	at hudson.model.Project.onLoad(Project.java:83)	at hudson.model.Items.load(Items.java:221)	at hudson.model.ItemGroupMixIn.copy(ItemGroupMixIn.java:208)	at hudson.model.ItemGroupMixIn.createTopLevelItem(ItemGroupMixIn.java:164)	at jenkins.model.Jenkins.doCreateItem(Jenkins.java:2857)	at jenkins.model.Jenkins.doCreateItem(Jenkins.java:308)	at hudson.model.AllView.doCreateItem(AllView.java:76)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:288)	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:151)	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:90)	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:111)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:573)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:573)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:658)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:487)	at org.kohsuke.stapler.Stapler.service(Stapler.java:164)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)	at winstone.ServletConfiguration.execute(ServletConfiguration.java:248)	at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:376)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:95)	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87)	at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)	at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)	at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)	at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)	at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)	at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)	at winstone.RequestDispatcher.forward(RequestDispatcher.java:331)	at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:215)	at winstone.RequestHandlerThread.run(RequestHandlerThread.java:138)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)