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java.lang.NullPointerException: 	at jenkins.bouncycastle.api.PEMEncodable.decode(PEMEncodable.java:197)	at jenkins.bouncycastle.api.PEMEncodable.decode(PEMEncodable.java:133)	at hudson.plugins.ec2.EC2PrivateKey.getFingerprint(EC2PrivateKey.java:65)	at hudson.plugins.ec2.EC2PrivateKey.find(EC2PrivateKey.java:96)	at hudson.plugins.ec2.SlaveTemplate.getKeyPair(SlaveTemplate.java:863)	at hudson.plugins.ec2.SlaveTemplate.provisionOndemand(SlaveTemplate.java:450)	at hudson.plugins.ec2.SlaveTemplate.provision(SlaveTemplate.java:377)	at hudson.plugins.ec2.EC2Cloud.getNewOrExistingAvailableSlave(EC2Cloud.java:530)	at hudson.plugins.ec2.EC2Cloud.provision(EC2Cloud.java:547)	at hudson.slaves.NodeProvisioner$StandardStrategyImpl.apply(NodeProvisioner.java:701)	at hudson.slaves.NodeProvisioner.update(NodeProvisioner.java:307)	at hudson.slaves.NodeProvisioner.access$000(NodeProvisioner.java:60)	at hudson.slaves.NodeProvisioner$NodeProvisionerInvoker.doRun(NodeProvisioner.java:796)	at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:50)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)