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java.lang.ArrayIndexOutOfBoundsException: 0 at org.apache.mahout.utils.vectors.VectorHelper$2.apply(VectorHelper.java:132) at org.apache.mahout.utils.vectors.VectorHelper$2.apply(VectorHelper.java:129) at com.google.common.collect.Iterators$8.next(Iterators.java:812) at java.util.AbstractCollection.toArray(AbstractCollection.java:124) at java.util.ArrayList.<init>(ArrayList.java:131) at com.google.common.collect.Lists.newArrayList(Lists.java:119) at org.apache.mahout.utils.vectors.VectorHelper.toWeightedTerms(VectorHelper.java:128) at org.apache.mahout.utils.vectors.VectorHelper.vectorToJson(VectorHelper.java:147) at org.apache.mahout.utils.vectors.VectorDumper.run(VectorDumper.java:240) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) at org.apache.mahout.utils.vectors.VectorDumper.main(VectorDumper.java:260) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68) at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139) at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:194) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.RunJar.main(RunJar.java:160)