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

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java.lang.NullPointerException:
at hudson.plugins.swarm.Client.copy(Client.java:264)
at hudson.plugins.swarm.Client.createSwarmSlave(Client.java:238)
at hudson.plugins.swarm.Client.run(Client.java:153)
at hudson.plugins.swarm.Client.main(Client.java:87)

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