ABAP dump ASSIGN_TYPE_CONFLICT using dynamic table

ABAP dump ASSIGN_TYPE_CONFLICT using dynamic table on an alv when clicking buttons how to fix this ?

here's my code

** Dynamic Table Declarations
DATA :
gt_dyn_table     TYPE REF TO data,
 gw_dyn_line      TYPE REF TO data,
gw_dyn_line1     TYPE REF TO data,

FIELD-SYMBOLS: <gfs_line>,<gfs_line1>,
<gfs_dyn_table> TYPE STANDARD TABLE ,
<fs1>,<fs_color>.

* RTTS Declaratoins.
DATA :   gr_struct_typ   TYPE REF TO  cl_abap_datadescr,
         gr_dyntable_typ TYPE REF TO  cl_abap_tabledescr,
         ls_component    TYPE         cl_abap_structdescr=>component,
         gt_component    TYPE         cl_abap_structdescr=>component_table,

CREATE DATA:
gt_dyn_table TYPE HANDLE gr_dyntable_typ,
gw_dyn_line TYPE HANDLE gr_struct_typ,
gw_dyn_line1 TYPE HANDLE gr_struct_typ.

ASSIGN gt_dyn_table->* TO <gfs_dyn_table>.
ASSIGN gw_dyn_line->* TO <gfs_line>.

** Populate the dynamic table*****************

** SALV Declarations.
DATA  : 

lo_columns type ref to cl_salv_columns_table.

         lo_cols                TYPE REF TO cl_salv_columns,
        lo_salv_table          TYPE REF TO cl_salv_table,
        lo_column              TYPE REF TO cl_salv_column,
        col_name(30),
        col_desc(20).
  try.
      cl_salv_table=>factory(
        importing
          r_salv_table = lo_salv_table
        changing
          t_table      = <gfs_dyn_table> ). """""""""""
    catch cx_salv_msg.

  endtry.
* get columns object
lo_cols = lo_salv_table->get_columns( ).

lo_salv_table->get_functions( )->set_all( abap_true ).

lo_salv_table->get_columns( )->set_optimize( abap_true ).

lo_salv_table->get_columns( )->set_color_column( 't_color' ).

LOOP AT gt_component INTO ls_component.
TRY.
col_name = ls_component-name.
lo_column ?= lo_cols->get_column( col_name ).
col_desc = col_name.
lo_column->set_medium_text( col_desc ).
lo_column->set_output_length( 15 ).

CATCH cx_salv_not_found.                            
ENDTRY.

ENDLOOP.

  lo_salv_table->display( ).