Title: Error message
Last modified: August 20, 2016

---

# Error message

 *  [Snailbag](https://wordpress.org/support/users/snailbag/)
 * (@snailbag)
 * [13 years, 3 months ago](https://wordpress.org/support/topic/error-message-165/)
 * Hi,
 * When I change the status of the delivery note, the screen throws me four error
   messages, in each of the invoices.
 * This is the messages and I can´t find de messages and the solutions.
 * Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /
   homepages/26/d429402413/htdocs/E-Shop/wp-includes/post.php on line 390
 * Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /
   homepages/26/d429402413/htdocs/E-Shop/wp-includes/post.php on line 390
 * Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /
   homepages/26/d429402413/htdocs/E-Shop/wp-includes/post.php on line 390
 * Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /
   homepages/26/d429402413/htdocs/E-Shop/wp-includes/capabilities.php on line 486
 * I hope an answer
    Thanks and congratulions for your plugin !!
 * Snailbag
 * [http://wordpress.org/extend/plugins/web-invoice/](http://wordpress.org/extend/plugins/web-invoice/)

Viewing 1 replies (of 1 total)

 *  [Bob Moore](https://wordpress.org/support/users/vbobnet/)
 * (@vbobnet)
 * [13 years, 3 months ago](https://wordpress.org/support/topic/error-message-165/#post-3453963)
 * Receiving the same error. When attempting to mail an invoice, Web Invoice generates
   over fifty of these errors in sets of four or five from post.php on line 390 
   followed by one in capabilities line 486. Why?
 * Best regards

Viewing 1 replies (of 1 total)

The topic ‘Error message’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/web-invoice.svg)
 * [Web Invoice - Invoicing and billing for WordPress](https://wordpress.org/plugins/web-invoice/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/web-invoice/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/web-invoice/)
 * [Active Topics](https://wordpress.org/support/plugin/web-invoice/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/web-invoice/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/web-invoice/reviews/)

 * 1 reply
 * 2 participants
 * Last reply from: [Bob Moore](https://wordpress.org/support/users/vbobnet/)
 * Last activity: [13 years, 3 months ago](https://wordpress.org/support/topic/error-message-165/#post-3453963)
 * Status: not resolved