java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:428)
at hudson.plugins.sshslaves.SSHLauncher.launch(SSHLauncher.java:149)
at hudson.slaves.SlaveComputer$1.call(SlaveComputer.java:171)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)

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