i installed Jenkins application in my machine and i set the proxy correctly and whenever i was trying to install update plugins , it was showing below error. Kindly i need help for this.
{Installing Plugins/Upgrades
Preparation
Checking internet connectivity
Checking update center connectivity
Success
Mailer Plugin
Failure -
java.io.IOException: Downloaded file D:\Program Files (x86)\Jenkins\plugins\mailer.jpi.tmp does not match expected SHA-1, expected 'P/4FkIGX5LgM5+y4xIRxN02gTHs=', actual 'YfiBQ94e9LSERsFobM5+hzkvAwM='
at hudson.model.UpdateCenter.verifyChecksums(UpdateCenter.java:1307)
at hudson.model.UpdateCenter.access$900(UpdateCenter.java:124)
at hudson.model.UpdateCenter$InstallationJob.replace(UpdateCenter.java:1406)
at hudson.model.UpdateCenter$UpdateCenterConfiguration.install(UpdateCenter.java:846)
at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1186)
at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1364)
at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1161)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110)
at java.lang.Thread.run(Unknown Source)}