theming_example.module

function theming_example_page() {
  $content[] = t('Some examples of pages and forms that are run through theme functions.');
  $content[] = l(t('Simple page with a list'), 'examples/theming_example/theming_example_list_page');
  $content[] = l(t('Simple form 1'), 'examples/theming_example/theming_example_order_form');
  $content[] = l(t('Simple form 2'), 'examples/theming_example/theming_example_text_form');
  $content['#theme_wrappers'] = array('theming_example_content_array');
  return $content;
}

does not exist

examples/theming_example/theming_example_order_form

i think it should be

examples/theming_example/theming_example_select_form