Title: 2.8 Upgrade – Fatal error: Class ‘WP_Widget’ not found
Last modified: August 19, 2016

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# 2.8 Upgrade – Fatal error: Class ‘WP_Widget’ not found

 *  Resolved [murph00009](https://wordpress.org/support/users/murph00009/)
 * (@murph00009)
 * [16 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-class-wp_widget-not-found/)
 * I logged in today and saw that I could upgrade to wordpress 2.8 and when I did
   I got this error.
 * Fatal error: Class ‘WP_Widget’ not found in /var/www/wp-includes/default-widgets.
   php on line 15
 * If it helps it was running and when it got to this page
 * [http://xxxxxxxxxx/wp-admin/update-core.php?action=do-core-upgrade&_wpnonce=0c425a26ff](http://xxxxxxxxxx/wp-admin/update-core.php?action=do-core-upgrade&_wpnonce=0c425a26ff)
 * it said The requested URL could not be retrieved
 * Can anyone help me fix it?
 * Thanks

Viewing 7 replies - 1 through 7 (of 7 total)

 *  Thread Starter [murph00009](https://wordpress.org/support/users/murph00009/)
 * (@murph00009)
 * [16 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-class-wp_widget-not-found/#post-1102395)
 * anyone have any ideas?
 *  Moderator [Jan Dembowski](https://wordpress.org/support/users/jdembowski/)
 * (@jdembowski)
 * Forum Moderator and Brute Squad
 * [16 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-class-wp_widget-not-found/#post-1102406)
 * What’s the state of your install? I mean, is your blog fully functioning but 
   just not on 2.8?
 * If you are on 2.7.1 and it’s working try this:
 * 1. Backup and get ready to restore just in case (always, always, always a good
   idea):
 * [http://codex.wordpress.org/WordPress_Backups](http://codex.wordpress.org/WordPress_Backups)
   
   [http://codex.wordpress.org/Backing_Up_Your_Database](http://codex.wordpress.org/Backing_Up_Your_Database)
   [http://codex.wordpress.org/Restoring_Your_Database_From_Backup](http://codex.wordpress.org/Restoring_Your_Database_From_Backup)
 * 2. De-activate ALL of your plugins and switch to the default theme. This is only
   temporary.
 * 3. Do the upgrade.
 * If it goes well, then switch your theme back and re-activate your plugins.
 * If it does not go well you can always restore your blog back to the way it was
   and try upgrading the old fashioned way.
 * [http://codex.wordpress.org/Upgrading_WordPress](http://codex.wordpress.org/Upgrading_WordPress)
 * Good luck.
 *  Thread Starter [murph00009](https://wordpress.org/support/users/murph00009/)
 * (@murph00009)
 * [16 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-class-wp_widget-not-found/#post-1102450)
 * I ran the 2.8 auto install and I think it stopped before it completed. Any page
   I go to now gives me that error.
 *  Moderator [Jan Dembowski](https://wordpress.org/support/users/jdembowski/)
 * (@jdembowski)
 * Forum Moderator and Brute Squad
 * [16 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-class-wp_widget-not-found/#post-1102464)
 * Not good. Can you try backing up your files and then upload the WordPress 2.8
   files on top of your install?
 * Once that’s done try [http://YOUR-URL/wp-admin/](http://YOUR-URL/wp-admin/) and
   see if it lets you in.
 *  Moderator [Samuel Wood (Otto)](https://wordpress.org/support/users/otto42/)
 * (@otto42)
 * WordPress.org Admin
 * [16 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-class-wp_widget-not-found/#post-1102469)
 * Do the install manually, via FTP. Basically, after a failed upgrade, X not found
   means that the files didn’t get fully updated. Simply uploading the correct files
   will probably fix it.
 *  Thread Starter [murph00009](https://wordpress.org/support/users/murph00009/)
 * (@murph00009)
 * [16 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-class-wp_widget-not-found/#post-1102660)
 * Ok thanks, it turns out all I had to do was copy the files over and everything
   works fine. I just couldn’t do it before because I was at work and FTP wasn’t
   working for some reason.
 *  [dstegall](https://wordpress.org/support/users/dstegall/)
 * (@dstegall)
 * [16 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-class-wp_widget-not-found/#post-1103072)
 * I’ve done everything suggested above and still get the same error. 🙁

Viewing 7 replies - 1 through 7 (of 7 total)

The topic ‘2.8 Upgrade – Fatal error: Class ‘WP_Widget’ not found’ is closed to 
new replies.

 * In: [Installing WordPress](https://wordpress.org/support/forum/installation/)
 * 7 replies
 * 4 participants
 * Last reply from: [dstegall](https://wordpress.org/support/users/dstegall/)
 * Last activity: [16 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-class-wp_widget-not-found/#post-1103072)
 * Status: resolved

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