[support] Writing a module and get an error

Hi All, I am in Chapter 2 of Tomlinson's et al book about Pro Drupal 7 Development. Get the following error upon completion of the code: *Warning*: require_once(/home3/tonymacc/public_html/drupal-7.0/modules/system/annotate.admin.inc) [function.require-once<http://tony-mac.com/drupal-7.0/admin/function.require-once>]: failed to open stream: No such file or directory in * menu_execute_active_handler()* (line *499* of * /home3/tonymacc/public_html/drupal-7.0/includes/menu.inc*). Grateful for any pointers. Thanks Tony -- *tony maciejowski** | analyst/programmer | websites | tony@tony-mac.com<t_maciejowski@hotmail.com> * *O*ffice: 323.***.5137 | Cell: 323.***.6206 | Germany: 49-30-76764897