When i merge the segment encounter error, how can i solve it. Please...  Log as follows:

2017-10-11 15:24:56,139 ERROR [pool-9-thread-10] threadpool.DefaultScheduler:145 : ExecuteException job:7508dfa0-5a89-4c3c-8685-701226628207
org.apache.kylin.job.exception.ExecuteException: org.apache.kylin.job.exception.ExecuteException: java.lang.IllegalStateException: Invalid input data. Unordered data cannot be split into multi trees
at org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:135)
at org.apache.kylin.job.impl.threadpool.DefaultScheduler$JobRunner.run(DefaultScheduler.java:141)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.kylin.job.exception.ExecuteException: java.lang.IllegalStateException: Invalid input data. Unordered data cannot be split into multi trees
at org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:135)
at org.apache.kylin.job.execution.DefaultChainedExecutable.doWork(DefaultChainedExecutable.java:65)
at org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:125)
... 4 more
Caused by: java.lang.IllegalStateException: Invalid input data. Unordered data cannot be split into multi trees
at org.apache.kylin.dict.TrieDictionaryForestBuilder.addValue(TrieDictionaryForestBuilder.java:92)
at org.apache.kylin.dict.TrieDictionaryForestBuilder.addValue(TrieDictionaryForestBuilder.java:78)
at org.apache.kylin.dict.DictionaryGenerator$NumberTrieDictForestBuilder.addValue(DictionaryGenerator.java:261)
at org.apache.kylin.dict.DictionaryGenerator.buildDictionary(DictionaryGenerator.java:79)
at org.apache.kylin.dict.DictionaryGenerator.buildDictionary(DictionaryGenerator.java:64)
at org.apache.kylin.dict.DictionaryGenerator.mergeDictionaries(DictionaryGenerator.java:104)
at org.apache.kylin.dict.DictionaryManager.mergeDictionary(DictionaryManager.java:275)
at org.apache.kylin.engine.mr.steps.MergeDictionaryStep.mergeDictionaries(MergeDictionaryStep.java:146)
at org.apache.kylin.engine.mr.steps.MergeDictionaryStep.makeDictForNewSegment(MergeDictionaryStep.java:136)
at org.apache.kylin.engine.mr.steps.MergeDictionaryStep.doWork(MergeDictionaryStep.java:68)
at org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:125)
... 6 more