hudson.util.HudsonFailedToLoad: java.lang.NullPointerException
at hudson.WebAppMain$3.run(WebAppMain.java:244)
Caused by: java.lang.NullPointerException
at hudson.plugins.ec2.EC2Cloud.createCredentialsProvider(EC2Cloud.java:599)
at hudson.plugins.ec2.EC2Cloud.createCredentialsProvider(EC2Cloud.java:584)
at hudson.plugins.ec2.EC2Cloud.connect(EC2Cloud.java:620)
at hudson.plugins.ec2.EC2Computer._describeInstanceOnce(EC2Computer.java:166)
at hudson.plugins.ec2.EC2Computer._describeInstance(EC2Computer.java:149)
at hudson.plugins.ec2.EC2Computer.describeInstance(EC2Computer.java:107)
at hudson.plugins.ec2.EC2Computer.getUptime(EC2Computer.java:133)
at hudson.plugins.ec2.EC2RetentionStrategy.internalCheck(EC2RetentionStrategy.java:104)
at hudson.plugins.ec2.EC2RetentionStrategy.check(EC2RetentionStrategy.java:85)
at hudson.plugins.ec2.EC2RetentionStrategy.check(EC2RetentionStrategy.java:43)
at hudson.slaves.SlaveComputer$4.run(SlaveComputer.java:725)
at hudson.model.Queue._withLock(Queue.java:1303)
at hudson.model.Queue.withLock(Queue.java:1180)
at hudson.slaves.SlaveComputer.setNode(SlaveComputer.java:722)
at hudson.model.AbstractCIBase.updateComputer(AbstractCIBase.java:118)
at hudson.model.AbstractCIBase.access$000(AbstractCIBase.java:44)
at hudson.model.AbstractCIBase$2.run(AbstractCIBase.java:186)
at hudson.model.Queue._withLock(Queue.java:1303)
at hudson.model.Queue.withLock(Queue.java:1180)
at hudson.model.AbstractCIBase.updateComputerList(AbstractCIBase.java:169)
at jenkins.model.Jenkins.updateComputerList(Jenkins.java:1470)
at jenkins.model.Jenkins.<init>(Jenkins.java:948)
at hudson.model.Hudson.<init>(Hudson.java:85)
at hudson.model.Hudson.<init>(Hudson.java:81)
at hudson.WebAppMain$3.run(WebAppMain.java:227)