Hadoop 20个新闻组分类示例中如何解决load main类MahoutDriver错误

我试图在Mahout中运行2newsgroup分类示例。我已设置MAHOUT_LOCAL=true，分类器不显示混淆矩阵，并给出以下警告：

ok. You chose 2 and we'll use naivebayes
creating work directory at /tmp/mahout-work-cloudera
+ echo 'Preparing 20newsgroups data'
Preparing 20newsgroups data
+ rm -rf /tmp/mahout-work-cloudera/20news-all
+ mkdir /tmp/mahout-work-cloudera/20news-all
+ cp -R /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/alt.atheism /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/comp.graphics /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/comp.os.ms-windows.misc /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/comp.sys.ibm.pc.hardware /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/comp.sys.mac.hardware /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/comp.windows.x /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/misc.forsale /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/rec.autos /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/rec.motorcycles /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/rec.sport.baseball /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/rec.sport.hockey /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/sci.crypt /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/sci.electronics /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/sci.med /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/sci.space /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/soc.religion.christian /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/talk.politics.guns /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/talk.politics.mideast /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/talk.politics.misc /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-test/talk.religion.misc /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/alt.atheism /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/comp.graphics /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/comp.os.ms-windows.misc /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/comp.sys.ibm.pc.hardware /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/comp.sys.mac.hardware /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/comp.windows.x /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/misc.forsale /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/rec.autos /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/rec.motorcycles /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/rec.sport.baseball /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/rec.sport.hockey /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/sci.crypt /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/sci.electronics /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/sci.med /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/sci.space /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/soc.religion.christian /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/talk.politics.guns /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/talk.politics.mideast /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/talk.politics.misc /tmp/mahout-work-cloudera/20news-bydate/20news-bydate-train/talk.religion.misc /tmp/mahout-work-cloudera/20news-all
+ '[' '' '!=' '' ']'
+ echo 'Creating sequence files from 20newsgroups data'
Creating sequence files from 20newsgroups data
+ ./bin/mahout seqdirectory -i /tmp/mahout-work-cloudera/20news-all -o /tmp/mahout-work-cloudera/20news-seq -ow


MAHOUT_LOCAL is set, so we don't add HADOOP_CONF_DIR to classpath.
MAHOUT_LOCAL is set, running locally
Error: Could not find or load main class org.apache.mahout.driver.MahoutDriver

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请给我任何解决方案，谢谢。

此错误是由于不正确的apache maven路径和POM文件造成的。我只是将POM.xml文件（包括mahout master完整源代码）放在apache-maven-3.2.1下，然后再次运行命令。此方法肯定解决了此问题