Calling FM gui_upload in BSP

Hi
I am calling the FM "gui_upload" in my BSP in OnInputProcessing and I am getting the dump " OBJECTS_OBJREF_NOT_ASSIGNED" as soon as it reaches this FM.
Error on webpage :
Note
The following error text was processed in the system BWD : Access via 'NULL' object reference not possible.
The error occurred on the application server sapdevy_BWD_18 and in the work process 0 .
The termination type was: RABAX_STATE
The ABAP call stack was:
Function: DP_CONTROL_ASSIGN_TABLE of program SAPLCNDP
Method: DIRECTORY_LIST_FILES of program CL_GUI_FRONTEND_SERVICES======CP
Method: FILE_EXIST of program CL_GUI_FRONTEND_SERVICES======CP
Function: GUI_UPLOAD of program SAPLSFES
Method: ONINPUTPROCESSING of program CLO24DHTL8LLWSOFNRTJ2EVIH3DCVCP
Method: %_ONINPUTPROCESSING of program CL_O24DHTL8LLWSOFNRTJ2EVIH3DCVCP
Method: DO_REQUEST of program CL_BSP_PAGE===================CP
Method: ON_REQUEST of program CL_BSP_RUNTIME================CP
Method: IF_HTTP_EXTENSION~HANDLE_REQUEST of program CL_HTTP_EXT_BSP===============CP
Method: EXECUTE_REQUEST_FROM_MEMORY of program CL_HTTP_SERVER================CP
Please help me.

Alex,
Here is my code.
IF event->id = 'UPLOAD' .
CALL METHOD REQUEST->GET_FORM_FIELD
EXPORTING
NAME = 'echoFile'
RECEIVING
VALUE = v_fname.
CALL FUNCTION 'GUI_UPLOAD'
    EXPORTING
      filename                      = v_fname
      filetype                      = 'ASC'
      has_field_separator           = 'X'
    HEADER_LENGTH                 = 0
     READ_BY_LINE                  = 'X'
     dat_mode                      = ''
IMPORTING
    FILELENGTH                    =
    HEADER                        =
    TABLES
      data_tab                      = itab "gt_download " i_text_data
    EXCEPTIONS
      file_open_error               = 1
      file_read_error               = 2
      no_batch                      = 3
      gui_refuse_filetransfer       = 4
      invalid_type                  = 5
      no_authority                  = 6
      unknown_error                 = 7
      bad_data_format               = 8
      header_not_allowed            = 9
      separator_not_allowed         = 10
      header_too_long               = 11
      unknown_dp_error              = 12
      access_denied                 = 13
      dp_out_of_memory              = 14
      disk_full                     = 15
      dp_timeout                    = 16
      OTHERS                        = 17.
IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
            WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
Thanks
Sunny

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