Forms6i using WInsock

Hello guys
I am now develop a program using winsock to receive data sent on tcp/ip connection
but i have a difficulties in retrieving data from remote host, the data was not read .
below is my PL/SQL
PROCEDURE /* DataArrival */ EVENT0(interface OleObj, bytesTotal IN NUMBER)
IS
mydata varchar2(32767);
BEGIN
MSWinsock_IMSWinsockControl.GetData(:ITEM('block3.winsock').interface,TO_VAR
iant(mydata, VT_variant));
MSWinsock_IMSWinsockControl.Senddata(:ITEM('block3.winsock').interface,TO_VARIANT('masukan ' || mydata, VT_BSTR, true ));
:text_item5:=:text_item5 || '-' || mydata;
END;
any body help me please ..

any profressionals can help me urgently? many thanks.
the error code is:
FRM-40735: WHEN-BUTTON-PRESSED trigger raised unhandled exception ORA-100504

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