Title: Invalid Callback
Last modified: August 22, 2016

---

# Invalid Callback

 *  Resolved [Kevin Batdorf](https://wordpress.org/support/users/kbat82/)
 * (@kbat82)
 * [11 years, 7 months ago](https://wordpress.org/support/topic/invalid-callback/)
 * The contact form hangs after hitting send. The message is delivered, but the 
   user experience is broken. Here’s the response I get:
 * **Warning**: call_user_func_array() expects parameter 1 to be a valid callback,
   function ‘sf_send_mail_from_site_name’ not found or invalid function name in **/
   home/colby1/public_html/dev/public/wp/wp-includes/plugin.php** on line **214**
 *     ```
       {
            "mailSent":true,
            "into":"#wpcf7-f83-p376-o1",
            "captcha":null,
            "message":"Your message was sent successfully. Thanks."
       }
       ```
   

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Author [Takayuki Miyoshi](https://wordpress.org/support/users/takayukister/)
 * (@takayukister)
 * [11 years, 7 months ago](https://wordpress.org/support/topic/invalid-callback/#post-5418034)
 * Try deactivating all plugins, switching to the default theme, and reinstalling
   the latest Contact Form 7. The ‘sf_send_mail_from_site_name’ isn’t Contact Form
   7’s function.
 *  Thread Starter [Kevin Batdorf](https://wordpress.org/support/users/kbat82/)
 * (@kbat82)
 * [11 years, 7 months ago](https://wordpress.org/support/topic/invalid-callback/#post-5418135)
 * Thanks! It definitely was another plugin. There was just a typo in the function
   name which is why WP said it didnt exist.
 *  [Neil Murray](https://wordpress.org/support/users/buzztone/)
 * (@buzztone)
 * [11 years, 7 months ago](https://wordpress.org/support/topic/invalid-callback/#post-5418139)
 * If this resolves your question, it helps others contributing here, if you can
   flag your post as [resolved]

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Invalid Callback’ is closed to new replies.

 * ![](https://ps.w.org/contact-form-7/assets/icon.svg?rev=2339255)
 * [Contact Form 7](https://wordpress.org/plugins/contact-form-7/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/contact-form-7/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/contact-form-7/)
 * [Active Topics](https://wordpress.org/support/plugin/contact-form-7/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/contact-form-7/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/contact-form-7/reviews/)

 * 3 replies
 * 3 participants
 * Last reply from: [Neil Murray](https://wordpress.org/support/users/buzztone/)
 * Last activity: [11 years, 7 months ago](https://wordpress.org/support/topic/invalid-callback/#post-5418139)
 * Status: resolved