i am getting dump while downloading file to presentaion server .
please suggest me .
code is like below.
PARAMETERS : p_dwn TYPE dxfile-filename.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_dwn.
CALL FUNCTION 'F4_FILENAME'
EXPORTING
PROGRAM_NAME =
DYNPRO_NUMBER =
FIELD_NAME =
IMPORTING
file_name = p_dwn.
CALL FUNCTION 'GUI_DOWNLOAD'
EXPORTING
filename = p_dwn
filetype = 'ASC'
write_field_separator = 'X'
TABLES
data_tab = t_zvtpmheader.
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.