java.lang.ClassCastException: hudson.model.Hudson cannot be cast to hudson.model.Slave

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java.lang.ClassCastException: hudson.model.Hudson cannot be cast to hudson.model.Slave
at hudson.plugins.skype.im.transport.SkypeIMConnection.createConnection(SkypeIMConnection.java:147)
at hudson.plugins.skype.im.transport.SkypeIMConnection.connect(SkypeIMConnection.java:106)
at hudson.plugins.skype.im.transport.SkypeIMConnectionProvider.createConnection(SkypeIMConnectionProvider.java:53)
at hudson.plugins.im.IMConnectionProvider.create(IMConnectionProvider.java:65)
at hudson.plugins.im.IMConnectionProvider.access$600(IMConnectionProvider.java:22)
at java.lang.Thread.run(Thread.java:636)

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