Incorrect code

The following line is not correct.

  drupal_set_message(t('You must <a href="/admin/reports/settings">enable logging</a> first!'), 'error');

It should be changed in:

  drupal_set_message(t('You must <a href="@reports">enable logging</a> first!', array('@reports' =>url('admin/reports/settings'))), 'error');