mahout出错了，utility.concurrent.threadpool编程

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SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/Administrator/.m2/repository/org/slf4j/slf4j-jcl/1.6.0/slf4j-jcl-1.6.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/Administrator/.m2/repository/org/slf4j/slf4j-log4j12/1.5.11/slf4j-log4j12-1.5.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
Exception in thread "main" org.apache.mahout.cf.taste.common.TasteException: java.lang.NullPointerException
   at org.apache.mahout.cf.taste.impl.eval.AbstractDifferenceRecommenderEvaluator.execute(AbstractDifferenceRecommenderEvaluator.java:202)
   at org.apache.mahout.cf.taste.impl.eval.AbstractDifferenceRecommenderEvaluator.getEvaluation(AbstractDifferenceRecommenderEvaluator.java:182)
   at org.apache.mahout.cf.taste.impl.eval.AbstractDifferenceRecommenderEvaluator.evaluate(AbstractDifferenceRecommenderEvaluator.java:126)
   at mia.myRecommender.ItemAttrSimilarity.main(ItemAttrSimilarity.java:43)
Caused by: java.lang.NullPointerException
   at org.apache.mahout.cf.taste.impl.recommender.knn.KnnItemBasedRecommender.getInterpolations(KnnItemBasedRecommender.java:125)
   at org.apache.mahout.cf.taste.impl.recommender.knn.KnnItemBasedRecommender.doEstimatePreference(KnnItemBasedRecommender.java:148)
   at org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender.estimatePreference(GenericItemBasedRecommender.java:145)
   at org.apache.mahout.cf.taste.impl.eval.AbstractDifferenceRecommenderEvaluator$PreferenceEstimateCallable.call(AbstractDifferenceRecommenderEvaluator.java:248)
   at org.apache.mahout.cf.taste.impl.eval.AbstractDifferenceRecommenderEvaluator$PreferenceEstimateCallable.call(AbstractDifferenceRecommenderEvaluator.java:226)
   at org.apache.mahout.cf.taste.impl.eval.AbstractDifferenceRecommenderEvaluator$StatsCallable.call(AbstractDifferenceRecommenderEvaluator.java:288)
   at org.apache.mahout.cf.taste.impl.eval.AbstractDifferenceRecommenderEvaluator$StatsCallable.call(AbstractDifferenceRecommenderEvaluator.java:268)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   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)

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