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java.lang.NullPointerException: 	at hudson.plugins.ec2.SlaveTemplate.provisionSpot(SlaveTemplate.java:655)	at hudson.plugins.ec2.SlaveTemplate.provision(SlaveTemplate.java:285)	at hudson.plugins.ec2.EC2Cloud$1.call(EC2Cloud.java:398)	at hudson.plugins.ec2.EC2Cloud$1.call(EC2Cloud.java:394)	at jenkins.util.ContextResettingExecutorService$2.call(ContextResettingExecutorService.java:46)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)