when using this class cl_salv_table=>factory to display the alv in report ,

I am not able to show the data in the excel  and other standard buttons are working fine .

  anybody helps will give rating more.

  Please see the attached screenshot which i have been attached .

DATA:go_alv TYPE REF TO cl_salv_table,

      go_columns TYPE REF TO cl_salv_columns,

      go_funs TYPE REF TO cl_salv_functions.

   DATA: gr_layout TYPE REF TO cl_salv_layout.

*

   TRY.

       CALL METHOD cl_salv_table=>factory

         IMPORTING

           r_salv_table = go_alv

         CHANGING

           t_table      = itab.

     CATCH cx_salv_msg.                                  "#EC NO_HANDLER

   ENDTRY.

   go_funs = go_alv->get_functions( ).

   go_funs->set_all( ).

   go_columns = go_alv->get_columns( ).

   go_columns->set_optimize( 'X' ).

   gr_layout = go_alv->get_layout( ).

   gr_layout->set_save_restriction( cl_salv_layout=>restrict_none ).

   go_alv->display( ).

this is the code i am using to display the report . please suggest  me any thing i am wrong .

Thanks In Advance.