Property "labelFor" of the label is empty

Dear Experts,
I have created a simple project which contains a view and a service call and an ALV top of list.
Without the top of list, the project works perfectly. However, after I added the top of list,
The error message looks like the following:
Note
The following error text was processed in the system SB4 : Adapter error in
&VIEW_ELEMENT_TYPE& "_2D" of view "SALV_WD_TABLE.VIEW_TOP_OF_LIST_I":
Property "labelFor" of the label is empty. It must always contain the ID of a UI element
Here are the code in my WDDOINIT and WDDOMODIFYVIEW.
method WDDOINIT .
data:
        node_top_of_list type ref to if_wd_context_node,
        elem_top_of_list type ref to if_wd_context_element,
        ls_top_of_list type if_componentcontroller=>element_top_of_list1.
node_top_of_list = wd_context->get_child_node( name = 'TOP_OF_LIST1' ).
elem_top_of_list = node_top_of_list->get_element( ).
ls_top_of_list-date = sy-datum.
ls_top_of_list-uname = sy-uname.
elem_top_of_list->set_static_attributes(
    exporting
      static_attributes = ls_top_of_list ).
* handle ALV
data:
        l_ref_com_usage type ref to if_wd_component_usage.
l_ref_com_usage = wd_this->wd_cpuse_alv_table( ).
if l_ref_com_usage->has_active_component( ) is initial.
    l_ref_com_usage->create_component( ).
endif.
data:
        l_ref_interfacecontroller type ref to iwci_salv_wd_table.
        l_ref_interfacecontroller = wd_this->wd_cpifc_alv_table( ).
data:
        l_value type ref to cl_salv_wd_config_table.
        l_value = l_ref_interfacecontroller->get_model( ).
data:
        lr_flow type ref to cl_salv_form_layout_grid,
        r_value type ref to cl_salv_form_label,
        r_value1 type ref to cl_salv_form_text.
create object lr_flow.
r_value1 = lr_flow->create_text( row = 1 column = 2 text = sy-uname ).
r_value = lr_flow->create_label( row = 1 column = 2 text = 'User: ' r_label_for = r_value1 ).
r_value1 = lr_flow->create_text( row = 1 column = 2 text = sy-datum ).
r_value = lr_flow->create_label( row = 1 column = 2 text = 'Date: ' r_label_for = r_value1 ).
node_top_of_list = wd_context->get_child_node( name = 'TOP_OF_LIST' ).
call method node_top_of_list->set_attribute
    exporting
        value = lr_flow
        name = 'CONTENT'.
* Set top of list
   l_value->if_salv_wd_table_settings~set_top_of_list_visible(
    value = abap_true ).
endmethod.
method WDDOMODIFYVIEW .
DATA lo_COMPONENTCONTROLLER TYPE REF TO IG_COMPONENTCONTROLLER .
lo_COMPONENTCONTROLLER =   wd_this->get_componentcontroller_ctr( ).
    lo_componentcontroller->execute_zbapi_get_time(
endmethod.
Can someone help please?
Thanks,
AS

Hi Bala,
I just made some modification to the following and it works fines now.
r_value1 = lr_flow->create_text( row = 1 column = 2 text = sy-uname ).
To:
r_value1 = lr_flow->create_text( row = 1 column = 2 text = 'Test' ).
How can I display sy-name rather than some text input?
Thanks,
AS

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