Problem with LargeObjects (client code attached)

Problem with LargeObjects

When I used
prepstmt.setBytes(3,bytearray);
the following exception was thrown by the driver: postgresql.fp.error

This exception is being thrown by the fastpath function of the Fastpath class as a result of the call fp.fastpath("lowrite",false,args) in LargeObject's "write" method.
What is the reason for this error?
What is the solution?

Thank you very much,
Rajesh

this is the client code:

String query = new String("insert into objectidtest values (?,?)");

outPStmt = dbConnect.prepareStatement(queryString);
outPStmt.setInt(1,1);
String imageName = new String("X:/14.gif" );
File file = new File(imageName);
FileInputStream fis = new FileInputStream(file);
byte[] image = new byte[(int)file.length()];
fis.read(image);
//Blob b = new byte[(int)file.length()];
outPStmt.setBytes(2,image);

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