Caused by: java.lang.IllegalArgumentException: userData cannot be empty
   	at    com.google.common.base.Preconditions.checkArgument(Preconditions.java:92)
	at org.jclouds.ec2.options.RunInstancesOptions.withUserData(RunInstancesOptions.java:89)
	at org.jclouds.ec2.compute.strategy.CreateKeyPairAndSecurityGroupsAsNeededAndReturnRunOptions.execute(CreateKeyPairAndSecurityGroupsAsNeededAndReturnRunOptions.java:95)
	at org.jclouds.ec2.compute.strategy.EC2CreateNodesInGroupThenAddToSet.createKeyPairAndSecurityGroupsAsNeededThenRunInstances(EC2CreateNodesInGroupThenAddToSet.java:216)
	at org.jclouds.ec2.compute.strategy.EC2CreateNodesInGroupThenAddToSet.runInstancesAndWarnOnInvisible(EC2CreateNodesInGroupThenAddToSet.java:154)
	at org.jclouds.ec2.compute.strategy.EC2CreateNodesInGroupThenAddToSet.execute(EC2CreateNodesInGroupThenAddToSet.java:135)
	at org.jclouds.compute.internal.BaseComputeService.createNodesInGroup(BaseComputeService.java:212)
	at org.jclouds.ec2.compute.EC2ComputeService.createNodesInGroup(EC2ComputeService.java:147)
	at jenkins.plugins.jclouds.compute.JCloudsSlaveTemplate.get(JCloudsSlaveTemplate.java:316)
	at jenkins.plugins.jclouds.compute.JCloudsSlaveTemplate.provisionSlave(JCloudsSlaveTemplate.java:182)
	at jenkins.plugins.jclouds.compute.JCloudsCloud.doProvision(JCloudsCloud.java:283)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)
	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)
	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:120)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:728)