Google Analytics Plugin error after WordPress 2.8 upgrade

Using the Automatic Upgrade is always fast and easy, but this time, it presented me with an error message after upgrading:

Fatal error: Call to undefined function is_site_admin() in /root directory/public_html/wp-content/plugins/sem-google-analytics/sem-google-analytics-admin.php on line 20

To fix the error and get back your wp-admin page, you need to go to the File Manager utility of your Web Host, go to your Plugins directory and rename the folder sem-google-analytics to some other name such as sem-google-analytics-orig or you can also delete sem-google-analytics folder

Refresh your wp-admin page and the sem-google-analytics plugin will automatically be deactivated.

Just wait for an upgrade from the Plugin author before activating it again, or simply replace it by a similar plugin.