Read multiple excel sheets using dataset...

Hello Experts,
I've searched the forums and I cannot find any suitable threads for regarding my question. Anyway, I wanto to read and .XLS file residing in the application server using the DATASET commands.However, I am having a shortdump saying "An exception with the type CX_SY_CONVERSION_CODEPAGE".

Continue.......
IF iref_error->has_failed = 'X'.
    CALL METHOD iref_error->raise_message
      EXPORTING
        type = 'I'.
    LEAVE LIST-PROCESSING.
ENDIF.
CALL METHOD iref_document->release_document
* EXPORTING
*    no_flush = ' '
     IMPORTING
       error    = iref_error
*    retcode =
IF iref_error->has_failed = 'X'.
    CALL METHOD iref_error->raise_message
      EXPORTING
        type = 'I'.
    LEAVE LIST-PROCESSING.
ENDIF.
*&      Form SUB_FILE_F4
*       F4 help for file path
FORM sub_file_f4 .
DATA:
l_desktop       TYPE string,
l_i_files       TYPE filetable,
l_wa_files      TYPE file_table,
l_rcode         TYPE int4.
* Finding desktop
CALL METHOD cl_gui_frontend_services=>get_desktop_directory
    CHANGING
      desktop_directory    = l_desktop
    EXCEPTIONS
      cntl_error           = 1
      error_no_gui         = 2
      not_supported_by_gui = 3
      OTHERS               = 4.
IF sy-subrc <> 0.
    MESSAGE e001(00) WITH
        'Desktop not found'.
ENDIF.
* Update View
CALL METHOD cl_gui_cfw=>update_view
    EXCEPTIONS
      cntl_system_error = 1
      cntl_error        = 2
      OTHERS            = 3.
CALL METHOD cl_gui_frontend_services=>file_open_dialog
     EXPORTING
       window_title            = 'Select Excel file'
       default_extension       = '.xls'
*      default_filename        =
       file_filter             = '.xls'
*      with_encoding           =
       initial_directory       = l_desktop
*      multiselection          =
    CHANGING
      file_table              = l_i_files
      rc                      = l_rcode
*     user_action             =
*     file_encoding           =
    EXCEPTIONS
      file_open_dialog_failed = 1
      cntl_error              = 2
      error_no_gui            = 3
      not_supported_by_gui    = 4
      OTHERS                  = 5
IF sy-subrc <> 0.
    MESSAGE e001(00) WITH 'Error while opening file'.
ENDIF.
READ TABLE l_i_files INDEX 1 INTO l_wa_files.
IF sy-subrc = 0.
    p_file = l_wa_files-filename.
ELSE.
    MESSAGE e001(00) WITH 'Error while opening file'.
ENDIF.

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