ABAP2XLXS error

I have added the following line of code to the demo program ZDEMO_EXCEL3 (after the bind_table line) but this triggers the errors in the attached document when I try to open the xlxs file.  The program works perfectly well without this line of code.

  lo_worksheet->set_cell( ip_column = 'C' ip_row = 3 ip_value = 'Hello world' ).