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

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java.lang.NullPointerException:
at com.amazonaws.services.ecs.AmazonECSClient.invoke(AmazonECSClient.java:2187)
at com.cloudbees.jenkins.plugins.amazonecs.ECSCloud$ProvisioningCallback.call(ECSCloud.java:196)
at com.cloudbees.jenkins.plugins.amazonecs.ECSCloud$ProvisioningCallback.call(ECSCloud.java:175)
at jenkins.util.ContextResettingExecutorService$2.call(ContextResettingExecutorService.java:46)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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