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java.lang.NullPointerException: 	at org.jenkinsci.plugins.ghprb.GhprbRepository.hookExist(GhprbRepository.java:270)	at org.jenkinsci.plugins.ghprb.GhprbRepository.createHook(GhprbRepository.java:289)	at org.jenkinsci.plugins.ghprb.GhprbTrigger.start(GhprbTrigger.java:260)	at org.jenkinsci.plugins.ghprb.GhprbTrigger.start(GhprbTrigger.java:66)	at hudson.model.AbstractProject.submit(AbstractProject.java:1884)	at hudson.model.Project.submit(Project.java:230)	at hudson.model.Job.doConfigSubmit(Job.java:1246)	at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:796)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:324)	at org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:52)	at org.kohsuke.stapler.PreInvokeInterceptedFunction.invoke(PreInvokeInterceptedFunction.java:26)	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:167)	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:100)	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:124)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)