运行apache mahout quickstartryin时出现问题

我试图从快速入门运行mahout集群示例： https ： //cwiki.apache.org/MAHOUT/clustering-of-synthetic-control-data.html

当运行这里指定的任何集群实现时，我会得到以下exception：

我不明白的是，我已经从网站上下载了最新的mahout副本，并使用maven构build它。 一个class级如何失踪？

任何帮助，高度赞赏。

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谢谢。

Error: java.lang.ClassNotFoundException: org.apache.mahout.math.Vector at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:247) at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:762) at org.apache.hadoop.io.WritableName.getClass(WritableName.java:71) at org.apache.hadoop.io.SequenceFile$Reader.getValueClass(SequenceFile.java:1613) at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1555) at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1428) at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1417) at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1412) at org.apache.hadoop.mapreduce.lib.input.SequenceFileRecordReader.initialize(SequenceFileRecordReader.java:50) at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:418) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:620) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305) at org.apache.hadoop.mapred.Child.main(Child.java:170) 11/06/19 16:15:35 INFO mapred.JobClient: Task Id : attempt_201106191612_0002_m_000000_1, Status : FAILED Error: java.lang.ClassNotFoundException: org.apache.mahout.math.Vector at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:247) at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:762) at org.apache.hadoop.io.WritableName.getClass(WritableName.java:71) at org.apache.hadoop.io.SequenceFile$Reader.getValueClass(SequenceFile.java:1613) at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1555) at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1428) at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1417) at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1412) at org.apache.hadoop.mapreduce.lib.input.SequenceFileRecordReader.initialize(SequenceFileRecordReader.java:50) at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:418) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:620) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305) at org.apache.hadoop.mapred.Child.main(Child.java:170)