젠킨스에서 plugin을 사용시 업데이트할때 아래와 같은 오류가 날 경우가 있다. WARNING: org.jenkinsci.plugins.ghprb.GhprbTrigger.run() failed for hudson.model.FreeStyleProject@4853e929[android-phoenix-qa-emulator] java.lang.Error: org.kohsuke.github.HttpException: Server returned HTTP response code: -1, message: 'null' for URL: https://api.github.com/repos/nytm/android-phoenix/pulls?state=open at org.kohsuke.github.Requester$Pa..