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java.lang.NullPointerException: 	at org.apache.hadoop.mapreduce.counters.Limits.filterName(Limits.java:44)	at org.apache.hadoop.mapreduce.counters.Limits.filterGroupName(Limits.java:52)	at org.apache.hadoop.mapreduce.counters.AbstractCounters.getGroup(AbstractCounters.java:220)	at org.apache.hadoop.mapred.Counters.getGroup(Counters.java:113)	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.saveCounters(JobControlCompiler.java:360)	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.updateMROpPlan(JobControlCompiler.java:332)	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:387)	at org.apache.pig.PigServer.launchPlan(PigServer.java:1322)	at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1307)	at org.apache.pig.PigServer.storeEx(PigServer.java:978)	at org.apache.pig.PigServer.store(PigServer.java:942)	at org.apache.pig.PigServer.openIterator(PigServer.java:855)	at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:774)	at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:372)	at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:198)	at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:173)	at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:84)	at org.apache.pig.Main.run(Main.java:607)	at org.apache.pig.Main.main(Main.java:156)	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.apache.hadoop.util.RunJar.main(RunJar.java:212)