Title: 500 error on form submit
Last modified: September 1, 2016

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# 500 error on form submit

 *  Resolved [stevenkellow](https://wordpress.org/support/users/stevenkellow/)
 * (@stevenkellow)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/500-error-on-form-submit/)
 * I’m getting a 500 error when submitting any form on site, I’ve decativated my
   theme’s functions.php and it’s still occurring. Any ideas?
 * Example form: [http://www.obraichean.co.uk/contact-us/](http://www.obraichean.co.uk/contact-us/)
 * [https://wordpress.org/plugins/ninja-forms/](https://wordpress.org/plugins/ninja-forms/)

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

 *  Thread Starter [stevenkellow](https://wordpress.org/support/users/stevenkellow/)
 * (@stevenkellow)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/500-error-on-form-submit/#post-7682238)
 * For reference, here are the PHP error logs that are being thrown:
    [19-Aug-2016
   12:28:35 UTC] PHP Fatal error: Call to undefined function nf_is_freemius_on()
   in SITEDIRECTORY/wp-content/plugins/ninja-forms/deprecated/ninja-forms.php on
   line 939 [19-Aug-2016 12:29:41 UTC] PHP Fatal error: Call to undefined function
   nf_is_freemius_on() in SITEDIRECTORY/wp-content/plugins/ninja-forms/deprecated/
   ninja-forms.php on line 939 [19-Aug-2016 12:32:11 UTC] PHP Warning: require_once(
   SITEDIRECTORY/wp-content/plugins/ninja-forms/lib/Freemius/includes/supplements/
   fs-essential-functions-1.1.7.1.php): failed to open stream: No such file or directory
   in SITEDIRECTORY/wp-content/plugins/ninja-forms/lib/Freemius/includes/fs-essential-
   functions.php on line 279 [19-Aug-2016 12:32:11 UTC] PHP Fatal error: require_once():
   Failed opening required ‘SITEDIRECTORY/wp-content/plugins/ninja-forms/lib/Freemius/
   includes/supplements/fs-essential-functions-1.1.7.1.php’ (include_path=’.:/usr/
   php/56/usr/lib64:/usr/php/56/usr/share/pear’) in SITEDIRECTORY/wp-content/plugins/
   ninja-forms/lib/Freemius/includes/fs-essential-functions.php on line 279
 *  [PaulBSelf](https://wordpress.org/support/users/paulbself/)
 * (@paulbself)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/500-error-on-form-submit/#post-7682253)
 * Getting the same issue on for submission
 * This worked before the latest updates to wordpress 4.6 and then Ninja form 2.9.56.2
 * Tested on various browsers.

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

The topic ‘500 error on form submit’ is closed to new replies.

 * ![](https://ps.w.org/ninja-forms/assets/icon-256x256.png?rev=1649747)
 * [Ninja Forms - The Contact Form Builder That Grows With You](https://wordpress.org/plugins/ninja-forms/)
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 * 2 replies
 * 2 participants
 * Last reply from: [PaulBSelf](https://wordpress.org/support/users/paulbself/)
 * Last activity: [9 years, 11 months ago](https://wordpress.org/support/topic/500-error-on-form-submit/#post-7682253)
 * Status: resolved