Title: Warning message?
Last modified: August 18, 2020

---

# Warning message?

 *  [itoilinks](https://wordpress.org/support/users/itoilinks/)
 * (@itoilinks)
 * [5 years, 9 months ago](https://wordpress.org/support/topic/warning-message-121/)
 * Hi!
    I do not understand what this message means? `Warning: call_user_func_array()
   expects parameter 1 to be a valid callback, function 'wp_admin_viewport_meta'
   not found or invalid function name in /home/cumpdchq/public_html/iamtoiam.com/
   wp-includes/class-wp-hook.php on line 288`
 * What does it mean?
    -  This topic was modified 5 years, 9 months ago by [Jan Dembowski](https://wordpress.org/support/users/jdembowski/).
      Reason: Moved to Fixing WordPress, this is not an Everything else WordPress
      topic
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fwarning-message-121%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Moderator [James Huff](https://wordpress.org/support/users/macmanx/)
 * (@macmanx)
 * [5 years, 9 months ago](https://wordpress.org/support/topic/warning-message-121/#post-13277839)
 * This may be a plugin or theme conflict. Please attempt to disable all plugins,
   and switch to the default Twenty Twenty theme. If the problem goes away, enable
   them one by one to identify the source of the problem.
 * If you can install plugins, install [Health Check](https://wordpress.org/plugins/health-check/).
   On the troubleshooting tab, you can click the button to disable all plugins and
   change the theme for you, while you’re still logged in, **without affecting normal
   visitors to your site**.

Viewing 1 replies (of 1 total)

The topic ‘Warning message?’ is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 1 reply
 * 2 participants
 * Last reply from: [James Huff](https://wordpress.org/support/users/macmanx/)
 * Last activity: [5 years, 9 months ago](https://wordpress.org/support/topic/warning-message-121/#post-13277839)
 * Status: not resolved

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