bootstrapping - Error in copying jars to /home/hadoop/lib emr -

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i copying external jars /home/hadoop/lib directoy in emr bootstrap process. showing following error during bootstrap process 

exception in thread "main" java.lang.incompatibleclasschangeerror: class com.google.common.cache.cachebuilder$3 has interface com.google.common.base.ticker super class     @ java.lang.classloader.defineclass1(native method)     @ java.lang.classloader.defineclass(classloader.java:792)     @ java.security.secureclassloader.defineclass(secureclassloader.java:142)     @ java.net.urlclassloader.defineclass(urlclassloader.java:449)     @ java.net.urlclassloader.access$100(urlclassloader.java:71)     @ java.net.urlclassloader$1.run(urlclassloader.java:361)     @ java.net.urlclassloader$1.run(urlclassloader.java:355)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(urlclassloader.java:354)     @ java.lang.classloader.loadclass(classloader.java:424)     @ sun.misc.launcher$appclassloader.loadclass(launcher.java:308)     @ java.lang.classloader.loadclass(classloader.java:357)     @ com.google.common.cache.cachebuilder.<clinit>(cachebuilder.java:207)     @ org.apache.hadoop.security.shellbasedunixgroupsmapping.<clinit>(shellbasedunixgroupsmapping.java:46)     @ java.lang.class.forname0(native method)     @ java.lang.class.forname(class.java:270)     @ org.apache.hadoop.conf.configuration.getclassbyname(configuration.java:861)     @ org.apache.hadoop.conf.configuration.getclass(configuration.java:906)     @ org.apache.hadoop.conf.configuration.getclass(configuration.java:932)     @ org.apache.hadoop.security.groups.<init>(groups.java:48)     @ org.apache.hadoop.security.groups.getusertogroupsmappingservice(groups.java:140)     @ org.apache.hadoop.security.usergroupinformation.initialize(usergroupinformation.java:205)     @ org.apache.hadoop.security.usergroupinformation.ensureinitialized(usergroupinformation.java:184)     @ org.apache.hadoop.security.usergroupinformation.issecurityenabled(usergroupinformation.java:236)     @ org.apache.hadoop.security.usergroupinformation.getloginuser(usergroupinformation.java:477)     @ org.apache.hadoop.security.usergroupinformation.getcurrentuser(usergroupinformation.java:463)     @ org.apache.hadoop.fs.filesystem$cache$key.<init>(filesystem.java:1521)     @ org.apache.hadoop.fs.filesystem$cache.get(filesystem.java:1422)     @ org.apache.hadoop.fs.filesystem.get(filesystem.java:256)     @ com.amazon.elasticmapreduce.scriptrunner.scriptrunner.fetchfile(scriptrunner.java:39)     @ com.amazon.elasticmapreduce.scriptrunner.scriptrunner.main(scriptrunner.java:56)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:606)     @ org.apache.hadoop.util.runjar.main(runjar.java:187)

can me why happening?

i found answer. problem mahout 0.7 using older version of guava. replaced mahout 0.7 0.8 , worked.


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