org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1066: Unable to open iterator for alias D

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ERROR 1066: Unable to open iterator for alias D

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java.io.IOException: Job terminated with anomalous status FAILED	at org.apache.pig.PigServer.openIterator(PigServer.java:423)	at org.apache.pig.tools.grunt.GruntParser.processDump(GruntParser.java:350)	at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:189)	at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:98)	at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:88)	at org.apache.pig.Main.main(Main.java:323)