Error User record

Why am I seeing errors when trying to add or edit a Drupal user record with Drupal version 4.7?

If you are using Drupal 4.7, you MUST set the UF_VERSION to 4.7 in your civicrm.settings.php file.

define ( 'CIVICRM_UF_VERSION' , '4.7');

Symptoms of not setting this value properly include:

• Blank screen when trying to add a user account
• Error messages such as... array_shift() [function.array-shift]: The argument should be an array in /[drupal path]/drupal/includes/form.inc on line 469.
  *... or other errors.