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java.lang.NullPointerException: 	at org.apache.pig.piggybank.storage.avro.AvroStorageUtils.isTupleWrapper(AvroStorageUtils.java:327)	at org.apache.pig.piggybank.storage.avro.PigSchema2Avro.convert(PigSchema2Avro.java:82)	at org.apache.pig.piggybank.storage.avro.PigSchema2Avro.convert(PigSchema2Avro.java:105)	at org.apache.pig.piggybank.storage.avro.PigSchema2Avro.convertRecord(PigSchema2Avro.java:151)	at org.apache.pig.piggybank.storage.avro.PigSchema2Avro.convert(PigSchema2Avro.java:62)	at org.apache.pig.piggybank.storage.avro.AvroStorage.checkSchema(AvroStorage.java:502)	at org.apache.pig.newplan.logical.rules.InputOutputFileValidator$InputOutputFileVisitor.visit(InputOutputFileValidator.java:65)	at org.apache.pig.newplan.logical.relational.LOStore.accept(LOStore.java:77)	at org.apache.pig.newplan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:64)	at org.apache.pig.newplan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:66)	at org.apache.pig.newplan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:66)	at org.apache.pig.newplan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:66)	at org.apache.pig.newplan.DepthFirstWalker.depthFirst(DepthFirstWalker.java:66)	at org.apache.pig.newplan.DepthFirstWalker.walk(DepthFirstWalker.java:53)	at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:50)	at org.apache.pig.newplan.logical.rules.InputOutputFileValidator.validate(InputOutputFileValidator.java:45)	at org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:292)	at org.apache.pig.PigServer.compilePp(PigServer.java:1360)	at org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1297)	at org.apache.pig.PigServer.execute(PigServer.java:1286)	at org.apache.pig.PigServer.access$400(PigServer.java:125)	at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1591)	at org.apache.pig.PigServer.registerQuery(PigServer.java:584)	at org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:942)	at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:386)	at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:188)	at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:164)	at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:67)	at org.apache.pig.Main.run(Main.java:487)	at org.apache.pig.Main.main(Main.java:108)	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:156)