Error when Calling a BAPI in ALV custom button "could not ascertain code"

Hi,
I am getting the error "Could not ascertain code page" when i try to call my BAPI (to export to excel sheet) on click of a custom button in ALV.
I have done the creation and event handling etc for the custom button.
Kindly help if anybody knows this error.
Thanks
Roshan

I am creating a custom export button(after disabling the standard export button) to download the data into an excel sheet in my own format. I have created the new button. The code is given here.
data lr_buttonui2 type ref to cl_salv_wd_fe_button.
data input2 type ref to cl_salv_wd_function.
data: lr_column_settings type ref to   if_salv_wd_column_settings,
lr_input_field type ref to cl_salv_wd_uie_input_field.
create object lr_buttonui2.
call method lr_buttonui2->set_text
exporting
    value = 'Export'
input2 = lo_value->if_salv_wd_function_settings~create_function( id = 'EXPORT' ).
input2->set_editor( lr_buttonui2 ).
data lr_ref3 type ref to cl_salv_wd_fe.
call method input2->get_editor
    receiving
      value = lr_ref3
I have also created the event handler for my button and written the below code thr. I am caling a BAPI to download the data into my excel format. The problem is coming here only.
data: lt_return type table of bapiret2.
data lo_nd_methcode type ref to if_wd_context_node.
data lo_el_methcode type ref to if_wd_context_element.
data ls_methcode type wd_this->element_methcode.
data lv_methcode like ls_methcode-methcode.
navigate from <CONTEXT> to <METHCODE> via lead selection
lo_nd_methcode = wd_context->get_child_node( name = wd_this->wdctx_methcode ).
get element via lead selection
lo_el_methcode = lo_nd_methcode->get_element( ).
get single attribute
lo_el_methcode->get_attribute(
    exporting
      name = `METHCODE`
    importing
      value = lv_methcode ).
call function 'ZBAPI_EXCEL_DLOAD_METHODOLOGY'
exporting
    i_methcode       = lv_methcode
tables
    et_return        = lt_return
Plz give me a solution

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