Title: Error on notification
Last modified: December 18, 2016

---

# Error on notification

 *  [diarmads](https://wordpress.org/support/users/diarnord/)
 * (@diarnord)
 * [9 years, 3 months ago](https://wordpress.org/support/topic/error-on-notification/)
 * Hi,
 * When I submit a form I get this error and when I disable Gravity PDF I do not
   get this error.
    What is problem with it and how to fix it?
 * Warning: Illegal string offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-
   content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1302 Warning: Cannot assign an empty string to a string offset
   in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302 Warning: Illegal
   string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on
   line 1307 Warning: Cannot assign an empty string to a string offset in /customers/
   a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/
   blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Illegal string
   offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355
   Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/
   wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1355 Warning: Illegal string offset ‘ID’ in /customers/a/c/
   0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1302 Warning: Cannot assign an empty string to
   a string offset in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302
   Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/
   wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1307 Warning: Cannot assign an empty string to a string offset
   in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Illegal
   string offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on
   line 1355 Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/
   httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1355 Warning: Illegal string offset ‘ID’ in /
   customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302 Warning: Cannot
   assign an empty string to a string offset in /customers/a/c/0/sitename/httpd.
   www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/
   classes/cssmgr.php on line 1302 Warning: Illegal string offset ‘LANG’ in /customers/
   a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/
   blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Cannot assign
   an empty string to a string offset in /customers/a/c/0/sitename/httpd.www/wp-
   content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1307 Warning: Illegal string offset ‘ID’ in /customers/a/c/
   0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1355 Warning: Illegal string offset ‘LANG’ in/
   customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355 Warning: A non-
   numeric value encountered in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/mpdf.php on line 30441
   Warning: Illegal string offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-
   content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1302 Warning: Cannot assign an empty string to a string offset
   in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302 Warning: Illegal
   string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on
   line 1307 Warning: Cannot assign an empty string to a string offset in /customers/
   a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/
   blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Illegal string
   offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355
   Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/
   wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1355 Warning: Illegal string offset ‘ID’ in /customers/a/c/
   0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1302 Warning: Cannot assign an empty string to
   a string offset in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302
   Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/
   wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1307 Warning: Cannot assign an empty string to a string offset
   in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Illegal
   string offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on
   line 1355 Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/
   httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1355 Warning: A non-numeric value encountered
   in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/mpdf.php on line 30441 Warning: Illegal string 
   offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302
   Warning: Cannot assign an empty string to a string offset in /customers/a/c/0/
   sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1302 Warning: Illegal string offset ‘LANG’ in/
   customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Cannot
   assign an empty string to a string offset in /customers/a/c/0/sitename/httpd.
   www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/
   classes/cssmgr.php on line 1307 Warning: Illegal string offset ‘ID’ in /customers/
   a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/
   blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355 Warning: Illegal string
   offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355
   Warning: Illegal string offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-
   content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1302 Warning: Cannot assign an empty string to a string offset
   in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302 Warning: Illegal
   string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on
   line 1307 Warning: Cannot assign an empty string to a string offset in /customers/
   a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/
   blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Illegal string
   offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355
   Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/
   wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1355 Warning: Illegal string offset ‘ID’ in /customers/a/c/
   0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1302 Warning: Cannot assign an empty string to
   a string offset in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302
   Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/
   wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1307 Warning: Cannot assign an empty string to a string offset
   in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Illegal
   string offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on
   line 1355 Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/
   httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1355 Warning: Illegal string offset ‘ID’ in /
   customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302 Warning: Cannot
   assign an empty string to a string offset in /customers/a/c/0/sitename/httpd.
   www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/
   classes/cssmgr.php on line 1302 Warning: Illegal string offset ‘LANG’ in /customers/
   a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/
   blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Cannot assign
   an empty string to a string offset in /customers/a/c/0/sitename/httpd.www/wp-
   content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1307 Warning: Illegal string offset ‘ID’ in /customers/a/c/
   0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1355 Warning: Illegal string offset ‘LANG’ in/
   customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355 Warning: Illegal
   string offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on
   line 1302 Warning: Cannot assign an empty string to a string offset in /customers/
   a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/
   blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302 Warning: Illegal string
   offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307
   Warning: Cannot assign an empty string to a string offset in /customers/a/c/0/
   sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1307 Warning: Illegal string offset ‘ID’ in /
   customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355 Warning: Illegal
   string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on
   line 1355 Warning: Illegal string offset ‘ID’ in /customers/a/c/0/sitename/httpd.
   www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/
   classes/cssmgr.php on line 1302 Warning: Cannot assign an empty string to a string
   offset in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-
   pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302 Warning:
   Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/wp-content/
   plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.
   php on line 1307 Warning: Cannot assign an empty string to a string offset in/
   customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Illegal
   string offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on
   line 1355 Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/
   httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1355 Warning: A non-numeric value encountered
   in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/mpdf.php on line 30441 Warning: Illegal string 
   offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302
   Warning: Cannot assign an empty string to a string offset in /customers/a/c/0/
   sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/
   mpdf/classes/cssmgr.php on line 1302 Warning: Illegal string offset ‘LANG’ in/
   customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Cannot
   assign an empty string to a string offset in /customers/a/c/0/sitename/httpd.
   www/wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/
   classes/cssmgr.php on line 1307 Warning: Illegal string offset ‘ID’ in /customers/
   a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/
   blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355 Warning: Illegal string
   offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355
   Warning: Illegal string offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-
   content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1302 Warning: Cannot assign an empty string to a string offset
   in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/
   vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1302 Warning: Illegal
   string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/
   gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on
   line 1307 Warning: Cannot assign an empty string to a string offset in /customers/
   a/c/0/sitename/httpd.www/wp-content/plugins/gravity-forms-pdf-extended/vendor/
   blueliquiddesigns/mpdf/classes/cssmgr.php on line 1307 Warning: Illegal string
   offset ‘ID’ in /customers/a/c/0/sitename/httpd.www/wp-content/plugins/gravity-
   forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/cssmgr.php on line 1355
   Warning: Illegal string offset ‘LANG’ in /customers/a/c/0/sitename/httpd.www/
   wp-content/plugins/gravity-forms-pdf-extended/vendor/blueliquiddesigns/mpdf/classes/
   cssmgr.php on line 1355

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Author [Jake Jackson](https://wordpress.org/support/users/blue-liquid-designs/)
 * (@blue-liquid-designs)
 * [9 years, 3 months ago](https://wordpress.org/support/topic/error-on-notification/#post-8566072)
 * Those errors suggest you are running PHP7.1. Gravity PDF isn’t fully compatible
   with that version of PHP just yet. We’re working on our next major release now
   which will support it. Until that’s released I’d recommend using PHP7.0.
 *  Thread Starter [diarmads](https://wordpress.org/support/users/diarnord/)
 * (@diarnord)
 * [9 years, 3 months ago](https://wordpress.org/support/topic/error-on-notification/#post-8566088)
 * That was not the problem, I changed to PHP 7.0 and got the same error. The plugin
   works without any problem with another domain with PHP 7.1. Another option?
    -  This reply was modified 9 years, 3 months ago by [diarmads](https://wordpress.org/support/users/diarnord/).
 *  Plugin Author [Jake Jackson](https://wordpress.org/support/users/blue-liquid-designs/)
 * (@blue-liquid-designs)
 * [9 years, 3 months ago](https://wordpress.org/support/topic/error-on-notification/#post-8566236)
 * You can disable PHP error reporting in your browser to hide the warnings for 
   the time being until they are patched. Check if `WP_DEBUG` is set to `true` in
   your `wp-config.php` file on your web server, and if so set to `false` instead.
   If that doesn’t work you can try adding `error_reporting(0);` to the top of your
   wp-config.php file.
 *  Thread Starter [diarmads](https://wordpress.org/support/users/diarnord/)
 * (@diarnord)
 * [9 years, 3 months ago](https://wordpress.org/support/topic/error-on-notification/#post-8566252)
 * Thank you Jake!

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘Error on notification’ is closed to new replies.

 * ![](https://ps.w.org/gravity-forms-pdf-extended/assets/icon-256x256.png?rev=3168987)
 * [Gravity PDF](https://wordpress.org/plugins/gravity-forms-pdf-extended/)
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 * 4 replies
 * 2 participants
 * Last reply from: [diarmads](https://wordpress.org/support/users/diarnord/)
 * Last activity: [9 years, 3 months ago](https://wordpress.org/support/topic/error-on-notification/#post-8566252)
 * Status: not resolved