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java.lang.IncompatibleClassChangeError: Implementing class	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)	at java.lang.ClassLoader.defineClass(ClassLoader.java:621)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)	at java.net.URLClassLoader.access$000(URLClassLoader.java:58)	at java.net.URLClassLoader$1.run(URLClassLoader.java:197)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:171)	at org.apache.hadoop.mapred.SparkHadoopMapRedUtil$class.firstAvailableClass(SparkHadoopMapRedUtil.scala:48)	at org.apache.hadoop.mapred.SparkHadoopMapRedUtil$class.newJobContext(SparkHadoopMapRedUtil.scala:23)	at org.apache.hadoop.mapred.SparkHadoopWriter.newJobContext(SparkHadoopWriter.scala:40)	at org.apache.hadoop.mapred.SparkHadoopWriter.getJobContext(SparkHadoopWriter.scala:149)	at org.apache.hadoop.mapred.SparkHadoopWriter.preSetup(SparkHadoopWriter.scala:64)	at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopDataset(PairRDDFunctions.scala:713)	at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopFile(PairRDDFunctions.scala:686)	at org.apache.spark.rdd.PairRDDFunctions.saveAsHadoopFile(PairRDDFunctions.scala:572)	at org.apache.spark.rdd.RDD.saveAsTextFile(RDD.scala:894)	at org.apache.spark.examples.HdfsTest$$anonfun$main$1.apply$mcVI$sp(HdfsTest.scala:34)	at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:142)	at org.apache.spark.examples.HdfsTest$.main(HdfsTest.scala:28)	at org.apache.spark.examples.HdfsTest.main(HdfsTest.scala)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:297)	at java.lang.Thread.run(Thread.java:695)