java.lang.ClassNotFoundException: org.apache.mahout.math.Vector

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java.lang.ClassNotFoundException: org.apache.mahout.math.Vector	at java.net.URLClassLoader$1.run(URLClassLoader.java:372)	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:360)	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:344)	at org.apache.hadoop.conf.Configuration.getClassByNameOrNull(Configuration.java:1844)	at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1809)	at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1903)	at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:1929)	at org.apache.hadoop.mapred.JobConf.getMapOutputValueClass(JobConf.java:837)	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.init(MapTask.java:983)	at org.apache.hadoop.mapred.MapTask.createSortingCollector(MapTask.java:391)	at org.apache.hadoop.mapred.MapTask.access$100(MapTask.java:80)	at org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(MapTask.java:675)	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:747)	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)	at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168)	at java.security.AccessController.doPrivileged(Native Method)	at javax.security.auth.Subject.doAs(Subject.java:422)	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1614)	at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:163)