Yarn Scheduler Load Simulator does not work

Running the SLS, as per the instructions on the web results in a NullPointerException being thrown.

Steps followed to create error:

1) Download Apache Hadoop 2.7.0 tarball from Apache site
2) Untar 2.7.0 tarball into /opt directory
3) Execute the following command:

/opt/hadoop-2.7.0/share/hadoop/tools/sls//bin/slsrun.sh --input-rumen=/opt/hadoop-2.7.0/share/hadoop/tools/sls/sample-data/2jobs2min-rumen-jh.json --output-dir=/tmp

Results in the following error:

15/06/04 10:25:41 INFO rmnode.RMNodeImpl: a2118.smile.com:2 Node Transitioned from NEW to RUNNING
15/06/04 10:25:41 INFO capacity.CapacityScheduler: Added node a2118.smile.com:2 clusterResource: <memory:30720, vCores:30>
15/06/04 10:25:41 INFO util.RackResolver: Resolved a2115.smile.com to /default-rack
15/06/04 10:25:41 INFO resourcemanager.ResourceTrackerService: NodeManager from node a2115.smile.com(cmPort: 3 httpPort: 80) registered with capability: <memory:10240, vCores:10>, assigned nodeId a2115.smile.com:3
15/06/04 10:25:41 INFO rmnode.RMNodeImpl: a2115.smile.com:3 Node Transitioned from NEW to RUNNING
15/06/04 10:25:41 INFO capacity.CapacityScheduler: Added node a2115.smile.com:3 clusterResource: <memory:40960, vCores:40>
Exception in thread "main" java.lang.RuntimeException: java.lang.NullPointerException
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:134)
at org.apache.hadoop.yarn.sls.SLSRunner.startAMFromRumenTraces(SLSRunner.java:398)
at org.apache.hadoop.yarn.sls.SLSRunner.startAM(SLSRunner.java:250)
at org.apache.hadoop.yarn.sls.SLSRunner.start(SLSRunner.java:145)
at org.apache.hadoop.yarn.sls.SLSRunner.main(SLSRunner.java:528)
Caused by: java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:333)
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:988)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:126)
... 4 more