downloading image blobs

Hello,
I am having a similary problem that I was having when I was trying to
upload an image to the database. I am already able to upload blobs into
the database but I cannot download them.
I get the error 'inv_open: large object 12992 not found', which I assume
means that the statement should be in a transaction, but it is and it
still outputs the error.
Here is my code:
con.setAutoCommit(false);
Statement statement = con.createStatement();
ResultSet rs = statement.executeQuery("select image from
userpreferences where username='"+user+"'");
if(rs == null) return null;
rs.next();
InputStream is = rs.getBinaryStream("image"); <----- This is
where the error is thrown
JimiReader reader = Jimi.createJimiReader(is);
image = reader.getImage();
con.commit();
con.close();
return new ServerMessage(new JimiImageSerializer(image));
Here is my error stack trace:
FastPath call returned ERROR: inv_open: large object 12992 not found

at org.postgresql.fastpath.Fastpath.fastpath(Fastpath.java:126)
at org.postgresql.fastpath.Fastpath.fastpath(Fastpath.java:176)
at org.postgresql.fastpath.Fastpath.getInteger(Fastpath.java:188)
at
org.postgresql.largeobject.LargeObject.<init>(LargeObject.java:89)
at
org.postgresql.largeobject.LargeObjectManager.open(LargeObjectManager.java:134)
at
org.postgresql.jdbc2.ResultSet.getBinaryStream(ResultSet.java:437)
at
org.postgresql.jdbc2.ResultSet.getBinaryStream(ResultSet.java:544)
at
org.opensimpx.server.RequestHandler.getBackgroundImage(RequestHandler.java:688)
at
org.opensimpx.server.RequestHandler.handleRequest(RequestHandler.java:440)
at org.opensimpx.server.RequestHandler.run(RequestHandler.java:221)
at java.lang.Thread.run(Thread.java:479)

Any ideas?
Thank you in advanced,
Matt