EC2 plugin fails to start instances

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EC2 plugin fails to start instances

Jonathan-2
Hello,
This problem started about a week ago.
Hudson keep firing new instances on EC2 where most of them fail and
stay in the offline state
(see image:  http://dl.dropbox.com/u/1009366/Screen%20shot%202011-01-20%20at%2011.31.32%20AM.png)

The log on the instance says:
The instance i-03e9486f appears to be shut down. Aborting launch.

Here is the error that I see on the hudson log.
Jan 20, 2011 4:51:25 PM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.slaves.NodeProvisioner
$NodeProvisionerInvoker@6ad89088 failed
java.lang.NullPointerException
        at hudson.plugins.ec2.EC2Cloud.provision(EC2Cloud.java:205)
        at hudson.slaves.NodeProvisioner.update(NodeProvisioner.java:189)
        at hudson.slaves.NodeProvisioner.access$000(NodeProvisioner.java:53)
        at hudson.slaves.NodeProvisioner
$NodeProvisionerInvoker.doRun(NodeProvisioner.java:271)
        at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:54)
        at java.util.TimerThread.mainLoop(Timer.java:512)
        at java.util.TimerThread.run(Timer.java:462

Any idea how to solve that? Is it a problem in Hudson or with EC2?

Thanks,
Jonathan