java.lang.ArrayIndexOutOfBoundsException: 0

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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$2.apply(VectorHelper.java:129)
at java.util.AbstractCollection.toArray(AbstractCollection.java:124)
at java.util.ArrayList.(ArrayList.java:131)
at org.apache.mahout.utils.vectors.VectorHelper.toWeightedTerms(VectorHelper.java:128)
at org.apache.mahout.utils.vectors.VectorHelper.vectorToJson(VectorHelper.java:147)
at org.apache.mahout.utils.vectors.VectorDumper.run(VectorDumper.java:240)
at org.apache.mahout.utils.vectors.VectorDumper.main(VectorDumper.java:260)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
at org.apache.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)

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