Piggybank/AvroStorage RuntimeException

pig_1352835411845.log

Pig Stack Trace
---------------
ERROR 1200: Pig script failed to parse: 
<file test.pig, line 8, column 11> pig script failed to validate: java.lang.RuntimeException: could not instantiate 'org.apache.pig.piggybank.storage.avro.AvroStorage' with arguments 'null'

org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1000: Error during parsing. Pig script failed to parse: 
<file test.pig, line 8, column 11> pig script failed to validate: java.lang.RuntimeException: could not instantiate 'org.apache.pig.piggybank.storage.avro.AvroStorage' with arguments 'null'
	at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1597)
	at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1540)
	at org.apache.pig.PigServer.registerQuery(PigServer.java:540)
	at org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:970)
	at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:386)
	at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:189)
	at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:165)
	at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:84)
	at org.apache.pig.Main.run(Main.java:555)
	at org.apache.pig.Main.main(Main.java:111)
Caused by: Failed to parse: Pig script failed to parse: 
<file test.pig, line 8, column 11> pig script failed to validate: java.lang.RuntimeException: could not instantiate 'org.apache.pig.piggybank.storage.avro.AvroStorage' with arguments 'null'
	at org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:182)
	at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1589)
	... 9 more
Caused by: 
<file test.pig, line 8, column 11> pig script failed to validate: java.lang.RuntimeException: could not instantiate 'org.apache.pig.piggybank.storage.avro.AvroStorage' with arguments 'null'
	at org.apache.pig.parser.LogicalPlanBuilder.buildLoadOp(LogicalPlanBuilder.java:438)
	at org.apache.pig.parser.LogicalPlanGenerator.load_clause(LogicalPlanGenerator.java:3168)
	at org.apache.pig.parser.LogicalPlanGenerator.op_clause(LogicalPlanGenerator.java:1291)
	at org.apache.pig.parser.LogicalPlanGenerator.general_statement(LogicalPlanGenerator.java:789)
	at org.apache.pig.parser.LogicalPlanGenerator.statement(LogicalPlanGenerator.java:507)
	at org.apache.pig.parser.LogicalPlanGenerator.query(LogicalPlanGenerator.java:382)
	at org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:175)
	... 10 more
================================================================================

pig_local_stdout.txt

2012-11-13 19:36:51,890 [main] INFO  org.apache.pig.Main - Apache Pig version 0.10.0 (r1328203) compiled Apr 19 2012, 22:54:12
2012-11-13 19:36:51,891 [main] INFO  org.apache.pig.Main - Logging error messages to: /private/tmp/pig_1352835411845.log
2012-11-13 19:36:52.002 java[5270:1903] Unable to load realm mapping info from SCDynamicStore
2012-11-13 19:36:52,148 [main] INFO  org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to hadoop file system at: file:///
2012-11-13 19:36:52,388 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1200: Pig script failed to parse: 
<file test.pig, line 8, column 11> pig script failed to validate: java.lang.RuntimeException: could not instantiate 'org.apache.pig.piggybank.storage.avro.AvroStorage' with arguments 'null'
Details at logfile: /private/tmp/pig_1352835411845.log

test.pig

register avro-1.7.2.jar
register piggybank-0.10.0.jar

define AvroStorage org.apache.pig.piggybank.storage.avro.AvroStorage;

rmf '/tmp/count.txt'

messages = load '/tmp/messages.avro' using AvroStorage;

lower = foreach messages generate message_id, lower(topic) as topic;

result = count_star(lower)

store result into '/tmp/count.txt'