ORA-302000 Error On client_text_io.fopen()

Question

i am using a webutil library - client_text_io.fopen() on the form that was compiled on 10.1.2.3 version and this webutil_file.file_selection_dialog() built-in package. the webutil_file.file_selection_dialog() works but not the client_text_io.fopen(). when the form is run on the application server it is getting this error ORA-302000.
PROCEDURE prc_load_proj_alloc_data IS
  vFilename             VARCHAR2(100) := :control.drv_filename;
  vInputFile             client_text_io.FILE_TYPE;
  vLinebuf               VARCHAR2(2000);
  vCommaPosition     NUMBER := 0;
  TYPE                array_type IS VARRAY(10) OF VARCHAR2(100);
  vColumn            array_type := array_type('');
  vCtr                  BINARY_INTEGER := 1;
  vRowCtr            number := 0;
  vLineLoadCnt     number := 0;
begin
  -- cursor must be placed on the block
  go_block('MRC_PROJ_ALLOC_INTERFACE');
  go_item('MRC_PROJ_ALLOC_INTERFACE.ATTRIBUTE1'); 
  --extend and initialize the array to 9 columns
  vColumn.EXTEND(9,1);
  -- open the file for reading
  begin
    vInputFile := client_text_io.fopen(vFilename,'r');
  exception
       when others then
         alertme('note','SQLCODE '||SQLCODE);
         if SQLCODE = -302000 then
              alertme('note',errtyp||'-'||TO_CHAR(errnum)||': '||errtxt);
        loop
          alertme('note',TO_CHAR(TOOL_ERR.CODE) || ': ' || TOOL_ERR.MESSAGE);
          TOOL_ERR.POP;
          exit when TOOL_ERR.NERRORS = 0;
        end loop;
      end if;
  end;
end;
    the file that i am trying to read is in csv format and is not currently in use. i tried any other file from my local C:\ or D:\ drive and i am getting the same error. what could possiblly that i am missing? thanks.

Answer 1

we figured it out that the cause of issue was that the webutil.plx was on our application executable directory. basically we have the webutil.plx on a common directory applicable to other application and when we removed the webutil.plx on our application directory the ORA-302000 error was solved.