ClassCastExcetion on JOIN

Hi,
I've the following problem with a pig script but I can't figure out
where the problem is.
Please can you help me ?

Thanks

Davide B.

*PIG script*
data = LOAD 'test2.txt' AS (etype:chararray, eid:long, props:[{}]);
actors_map_all = FOREACH data GENERATE etype, eid, props#'actors' as actors;
actors_map = FILTER actors_map_all BY actors IS NOT NULL;
/*DUMP actors_map;*/
movie_actors_flattenlist = FOREACH actors_map GENERATE etype, eid, FLATTEN
(actors) as (actor_etype:chararray,actor_eid:long);
movie_actors_flattenlist_gen = FOREACH movie_actors_flattenlist GENERATE
etype, eid, actor_etype, (long)actor_eid;
/*DUMP actors_list_all;*/
/*DUMP movie_actors_flattenlist;*/
persons = FILTER data BY etype == 'person';
movie_actors_flattenlist_expanded = JOIN movie_actors_flattenlist_gen BY
(long)actor_eid, persons BY (long)eid;
DUMP movie_actors_flattenlist_expanded;

*test2.txt*
movie 1001 [actors#{(person,4001),(person,4002)}]
person 4001 [name#{(Bob)}]
person 4002 [name#{(Alice)}]

*error*
java.lang.ClassCastException: org.apache.pig.data.DataByteArray cannot be
cast to java.lang.Long
at
org.apache.pig.backend.hadoop.HDataType.getWritableComparableTypes(HDataType.java:118)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce$Map.collect(PigGenericMapReduce.java:111)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.runPipeline(PigGenericMapBase.java:284)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:277)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase.map(PigGenericMapBase.java:64)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:212)