Title: Warning: call_user_func_array() expects parameter 1
Last modified: August 28, 2019

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# Warning: call_user_func_array() expects parameter 1

 *  Resolved [samuel5](https://wordpress.org/support/users/samuel5/)
 * (@samuel5)
 * [6 years, 11 months ago](https://wordpress.org/support/topic/warning-call_user_func_array-expects-parameter-1-6/)
 * We are happy so far with the plugin. Just have one issue as explained below:
 * On Woocommerce Order Page, when we click on Complete Order – Save order and send
   detail it sends out order summary to the customer. The customer sees the following
   warning on the bottom of the order page:
    Warning: call_user_func_array() expects
   parameter 1 to be a valid callback, class ‘THWCFE_Admin_Settings_General’ does
   not have a method ‘display_custom_fields_in_email’ in /home/data_base1/public_html/
   wp-includes/class-wp-hook.php on line 286
 * What is causing this issue? How do we remove this?
 * Thanks and best regards
    Sam

Viewing 1 replies (of 1 total)

 *  Plugin Contributor [Ewout](https://wordpress.org/support/users/pomegranate/)
 * (@pomegranate)
 * [6 years, 11 months ago](https://wordpress.org/support/topic/warning-call_user_func_array-expects-parameter-1-6/#post-11875498)
 * This error is not from the WooCommerce PDF Invoices and Packing Slips plugin 
   but from another plugin: [https://wordpress.org/plugins/woo-checkout-field-editor-pro/](https://wordpress.org/plugins/woo-checkout-field-editor-pro/)

Viewing 1 replies (of 1 total)

The topic ‘Warning: call_user_func_array() expects parameter 1’ is closed to new
replies.

 * ![](https://ps.w.org/woocommerce-pdf-invoices-packing-slips/assets/icon-256x256.
   png?rev=2189942)
 * [PDF Invoices & Packing Slips for WooCommerce](https://wordpress.org/plugins/woocommerce-pdf-invoices-packing-slips/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/woocommerce-pdf-invoices-packing-slips/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/)
 * [Active Topics](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/woocommerce-pdf-invoices-packing-slips/reviews/)

 * 1 reply
 * 2 participants
 * Last reply from: [Ewout](https://wordpress.org/support/users/pomegranate/)
 * Last activity: [6 years, 11 months ago](https://wordpress.org/support/topic/warning-call_user_func_array-expects-parameter-1-6/#post-11875498)
 * Status: resolved