JDBC: java.sql.SQLException: results returned

Hackers,

I get the following error (see below) when I attempt to insert a row into
one of our tables.  I'm using postgres 6.4 with java/jdbc 1.2.1.

Any ideas on what it means? I can't seem to find documentation
on this particular exception anywhere?  

Thanks,

Eric

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INSERT INTO bad_urls(ID,DATA,ATTEMPTS,REASON) VALUES 
(3376,'http://www.oit.itd.umich.edu/projects/adw2k/chordata/aves.html',0,'Unknown 
Host')

java.sql.SQLException: results returned   at java.lang.Throwable.fillInStackTrace(Native Method)   at
java.lang.Throwable.fillInStackTrace(CompiledCode)   at java.lang.Throwable.<init>(Compiled Code)   at
java.lang.Exception.<init>(CompiledCode)   at java.sql.SQLException.<init>(SQLException.java:82)   at
postgresql.Statement.executeUpdate(CompiledCode)   at postgresql.PreparedStatement.executeUpdate(Compiled Code)   at
InsertError.record(CompiledCode)   at InsertError.record(Compiled Code)   at wbCheckUrl$CheckThread.run(Compiled Code)