selenium - Not able to install Jenkin Plugin -


getting below error message when upgrade jenkins 2.77 2.78 upgrade jenkins 2.78 failed: failed download http://updates.jenkins-ci.org/download/war/2.78/jenkins.war.

after click on retry button getting error message:-

checking internet connectivity
checking update center connectivity
java.net.httpretryexception: invalid response code (404) url: https://updates.jenkins.io/update-center.json?uctest
@ hudson.model.updatecenter$updatecenterconfiguration.testconnection(updatecenter.java:1258)
@ hudson.model.updatecenter$updatecenterconfiguration.checkupdatecenter(updatecenter.java:1053)
@ hudson.model.updatecenter$connectioncheckjob.run(updatecenter.java:1488)
@ java.util.concurrent.executors$runnableadapter.call(unknown source)
@ java.util.concurrent.futuretask.run(unknown source)
@ hudson.remoting.atmostonethreadexecutor$worker.run(atmostonethreadexecutor.java:110)
@ java.lang.thread.run(unknown source)


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