Version 1.159 broke SCP plugin.

Upgrading Hudson to version 1.159 breaks the SCP plugin. The plugin fails to
load with the following error:

29/11/2007 12:16:58 hudson.PluginManager <init> SEVERE: Failed to load a plug-in scp
hudson.util.IOException2: Failed to initialize
at hudson.PluginWrapper.load(PluginWrapper.java:253)
at hudson.PluginManager.<init>(PluginManager.java:90)
at hudson.model.Hudson.<init>(Hudson.java:235)
at hudson.WebAppMain$1.run(WebAppMain.java:109)
Caused by: java.lang.NoClassDefFoundError: com/jcraft/jsch/SftpException
at be.certipost.hudson.plugin.PluginImpl.start(PluginImpl.java:18)
at hudson.PluginWrapper.load(PluginWrapper.java:250)
... 3 more