when i build the cube,the step create htable failed,the error message below,why 
the reason
org.apache.kylin.engine.mr.exception.HadoopShellException: 
java.lang.NullPointerException       at 
org.apache.kylin.engine.mr.common.CubeStatsReader.getCuboidSizeMapFromRowCount(CubeStatsReader.java:227)
     at 
org.apache.kylin.engine.mr.common.CubeStatsReader.getCuboidSizeMap(CubeStatsReader.java:180)
         at 
org.apache.kylin.engine.mr.common.CubeStatsReader.getCuboidSizeMap(CubeStatsReader.java:176)
         at 
org.apache.kylin.storage.hbase.steps.CreateHTableJob.run(CreateHTableJob.java:100)
   at org.apache.kylin.engine.mr.MRUtil.runMRJob(MRUtil.java:93)   at 
org.apache.kylin.engine.mr.common.HadoopShellExecutable.doWork(HadoopShellExecutable.java:63)
        at 
org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:179)
       at 
org.apache.kylin.job.execution.DefaultChainedExecutable.doWork(DefaultChainedExecutable.java:71)
     at 
org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:179)
       at 
org.apache.kylin.job.impl.threadpool.DefaultScheduler$JobRunner.run(DefaultScheduler.java:113)
       at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
     at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
     at java.lang.Thread.run(Thread.java:748) result code:2  at 
org.apache.kylin.engine.mr.common.HadoopShellExecutable.doWork(HadoopShellExecutable.java:73)
        at 
org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:179)
       at 
org.apache.kylin.job.execution.DefaultChainedExecutable.doWork(DefaultChainedExecutable.java:71)
     at 
org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:179)
       at 
org.apache.kylin.job.impl.threadpool.DefaultScheduler$JobRunner.run(DefaultScheduler.java:113)
       at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
     at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
     at java.lang.Thread.run(Thread.java:748)

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