Tuesday, May 30, 2023

Fatal error undefined function is_network_admin() in wordpress

The problem:

You receive “Fatal error undefined function is_network_admin()” when you login to WordPress admin after updating WordPress.

Solution: Manual Update

This error is caused by a fail WordPress version upgrade. Try a manual update.

  • Download the latest WordPress zip file and unzip it.
  • Back up your WordPress.
  • Rename wp-includes and wp-admin directories to wp-includes.bak and wp-admin.bak.
  • Upload the wp-includesand wp-admin directories from unzipped folder to your web host via FTP.
  • Upload files from new wp-content to your existing wp-content folder. Replace and overwrite existing files.
  • Upload the new version of the rest of files from the root directory to your existing WordPress root directory.
  • Remove .maintenance at your WordPress directory via FTP.
  • Login to WordPress admin and you will be given a link to URL like “http://domain.com/wordpress/wp-admin/upgrade.php”. Follow the link and instructions.
  • Clear your cache to see the changes if you have caching enabled.

For more details about WordPress manual update, read http://codex.wordpress.org/Updating_WordPress#Manual_Update.

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