Title: Fatal error
Last modified: January 23, 2021

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# Fatal error

 *  Resolved [mchlschw](https://wordpress.org/support/users/mchlschw/)
 * (@mchlschw)
 * [5 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-3752/)
 * Hello after updating wordpress core files in wp-admin and wp-includes i get the
   following debugging errors:
 *     ```
       Fatal error: Uncaught Error: Class 'WP_Widget_Text' not found in /var/www/vhosts/lparchitektur.at/httpdocs/wp-includes/class-wp-widget-factory.php:61 Stack trace: #0 /var/www/vhosts/lparchitektur.at/httpdocs/wp-includes/widgets.php(115): WP_Widget_Factory->register() #1 /var/www/vhosts/lparchitektur.at/httpdocs/wp-includes/widgets.php(1774): register_widget() #2 /var/www/vhosts/lparchitektur.at/httpdocs/wp-includes/class-wp-hook.php(287): wp_widgets_init() #3 /var/www/vhosts/lparchitektur.at/httpdocs/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters() #4 /var/www/vhosts/lparchitektur.at/httpdocs/wp-includes/plugin.php(484): WP_Hook->do_action() #5 /var/www/vhosts/lparchitektur.at/httpdocs/wp-settings.php(557): do_action() #6 /var/www/vhosts/lparchitektur.at/httpdocs/wp-config.php(84): require_once('/var/www/vhosts...') #7 /var/www/vhosts/lparchitektur.at/httpdocs/wp-load.php(37): require_once('/var/www/vhosts...') #8 /var/www/vhosts/lparchitektur.at/httpdocs/wp-blog-header.php(13): require_once('/var/www/vhosts.. in /var/www/vhosts/lparchitektur.at/httpdocs/wp-includes/class-wp-widget-factory.php on line 61
       There has been a critical error on this website.
       ```
   
 * Can anyone help here? I have no idea what to do – frontend is just like before,
   but I can’t access the backend.
 * Regards,
    Michael
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffatal-error-3752%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Moderator [Steven Stern (sterndata)](https://wordpress.org/support/users/sterndata/)
 * (@sterndata)
 * Volunteer Forum Moderator
 * [5 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-3752/#post-13947398)
 * It looks like WP might be missing a file.
 * Replace the WP core files. Do step 1 here: [https://wordpress.org/support/article/updating-wordpress/#step-1-replace-wordpress-files](https://wordpress.org/support/article/updating-wordpress/#step-1-replace-wordpress-files)
 *  Thread Starter [mchlschw](https://wordpress.org/support/users/mchlschw/)
 * (@mchlschw)
 * [5 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-3752/#post-13948856)
 * Thanks, that helped. I was updating the core files yesterday what initially caused
   the error. When I was uploading the files today there where some files copied,
   which yesterday failed. Or something like that…
    Whatever, the WP-backend runs
   again!
 * Thank you very much,
    Michael

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Fatal error’ is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 2 replies
 * 2 participants
 * Last reply from: [mchlschw](https://wordpress.org/support/users/mchlschw/)
 * Last activity: [5 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-3752/#post-13948856)
 * Status: resolved

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