OBEX problem! IllegalStateException:add Notify when already added

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Hi guys,
I'm working to a Java application that should send a file using OBEX and without need of a server application running on the other device. So I have implemented successfully device and service discovery (with the uuid 0x1105 for ObjectPush) but I have a great problem in the next section of the application: I have created connection but I've got an error on Operation.dataOutputStream() method...

    private void pushImage(String serviceURL){
        
        HeaderSet hs = null;
        ClientSession cs = null;
        
        try {
            
            /* Start OBEX connection*/
            cs = (ClientSession) Connector.open(serviceURL);
            hs = cs.connect( hs );
            hs.getResponseCode();
            hs = cs.createHeaderSet();
            
        } catch (Exception e){
            
            append(checkNo);
            append( new StringItem( "ERROR! ", "Error creating OBEX connection!", StringItem.PLAIN  ) );
            
        }
        
        ...
        
        try {
            
            hs.setHeader( HeaderSet.LENGTH, new Long((long)(file.length)) );
            
            Operation op = cs.put(hs);
            
            // Debug message...
            append( new StringItem( "SUCCESS! ", "Start creation of DataOutputStream!", StringItem.PLAIN  ) );
            
            DataOutputStream out = op.openDataOutputStream();
            
            // Debug message...
            append(checkOk);
            append( new StringItem( "SUCCESS! ", "Starting transferring!" + file.length, StringItem.PLAIN  ) );
            
            out.write( file, 0, file.length );
            
            out.close();
            op.close();
            cs.disconnect(null);
            cs.close();
            
        } catch (Exception e){
            
            append(checkNo);
            append( new StringItem( "ERROR! ", "Sending file error: " + e.getClass() + e.getMessage(), StringItem.PLAIN  ) );
            
        }
        
        // Debug message...
        append(checkOk);
        append( new StringItem( "SUCCESS! ", "File successfully sended!", StringItem.PLAIN  ) );
        
    }

Anyone can help me? Thanks in advance.


P.S. I'm testing application with a Nokia N73

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yeeeeeeeess! problem solved! I have removed append methods and now application works perfectly. I can send files to my laptop with no problems...