Support for x86_64 using default ami

com.xerox.amazonws.ec2.EC2Exception: Client error : The requested instance type's architecture (x86_64) does not match the architecture in the manifest for ami-5926cb30 (i386)
at com.xerox.amazonws.ec2.Jec2.makeRequestInt(Jec2.java:1680)
at com.xerox.amazonws.ec2.Jec2.runInstances(Jec2.java:563)
at com.atlassian.aws.ec2.RemoteEC2InstanceImpl.backgroundStart(RemoteEC2InstanceImpl.java:365)
at com.atlassian.aws.ec2.RemoteEC2InstanceImpl.access$200(RemoteEC2InstanceImpl.java:25)
at com.atlassian.aws.ec2.RemoteEC2InstanceImpl$1.run(RemoteEC2InstanceImpl.java:117)
at com.atlassian.aws.ec2.RemoteEC2InstanceImpl$CatchingRunnableDecorator.run(RemoteEC2InstanceImpl.java:98)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
at java.util.concurrent.FutureTask.run(FutureTask.java:123)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:65)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:172)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:651)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:676)
at java.lang.Thread.run(Thread.java:595)