Title: call_user_func_array() expects parameter 1 to be a valid callback
Last modified: August 31, 2016

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# call_user_func_array() expects parameter 1 to be a valid callback

 *  [zigzagad](https://wordpress.org/support/users/zigzagad/)
 * (@zigzagad)
 * [10 years, 3 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-7/)
 * I’ve just installed the plugin on a brand new WordPress install to see if it 
   meets my needs, I’m getting the following error after activating:
 *  Warning: call_user_func_array() expects parameter 1 to be a valid callback, 
   class ‘Worldpay_Payments’ not found in /mypath/www.sandbox.dev/wp-includes/plugin.
   php on line 525
 * [https://wordpress.org/plugins/woo-easy-pay/](https://wordpress.org/plugins/woo-easy-pay/)

The topic ‘call_user_func_array() expects parameter 1 to be a valid callback’ is
closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/woo-easy-pay_ffffff.svg)
 * [Online Worldpay For WooCommerce](https://wordpress.org/plugins/woo-easy-pay/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/woo-easy-pay/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/woo-easy-pay/)
 * [Active Topics](https://wordpress.org/support/plugin/woo-easy-pay/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/woo-easy-pay/unresolved/)
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 * 0 replies
 * 1 participant
 * Last reply from: [zigzagad](https://wordpress.org/support/users/zigzagad/)
 * Last activity: [10 years, 3 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-7/)
 * Status: not resolved