Error on LoadFunc implementation

[Bae, Jae Hyeon]

Hi everyone.

I implemented LoadFunc and Slicer interface and I tried to use it with
the following pig script:

a = LOAD '/data/part-00000.anc.gz' USING MyStorage() AS (source:chararray);
b = FILTER a BY (source == 'http://www.sonyfinance.co.jp/');
DUMP b;

MapReduce job is dead immediately with the following error stack trace:

java.lang.ArrayIndexOutOfBoundsException: 0
        at 
org.apache.hadoop.mapred.JobInProgress.getTaskInProgress(JobInProgress.java:2523)
        at 
org.apache.hadoop.mapred.taskdetails_jsp._jspService(taskdetails_jsp.java:113)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:363)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
        at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
        at 
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
        at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:324)
        at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
        at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
        at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
        at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
        at 
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
        at 
org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)

What should I do to solve this problem? I am using hadoop-0.20.1 and pig-0.6.0.