Title: call_user_func_array() expects parameter 1 to be a valid callback
Last modified: August 22, 2016

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

 *  [Dddt](https://wordpress.org/support/users/dddt/)
 * (@dddt)
 * [11 years, 6 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-3/)
 * hi,
    thanks for plugin.
 * I am getting an error message like this:
 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, first
   array member is not a valid class name or object in /home/USERNAME/public_html/
   mywebsite.com/wp-includes/plugin.php on line 505
 * plus, I cannot see the title of posts on full size slider with regular shortcode.
 * P.S. How to select multiple categories for full size slider?
 * [https://wordpress.org/plugins/wp-slideshow-posts/](https://wordpress.org/plugins/wp-slideshow-posts/)

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 * 0 replies
 * 1 participant
 * Last reply from: [Dddt](https://wordpress.org/support/users/dddt/)
 * Last activity: [11 years, 6 months ago](https://wordpress.org/support/topic/call_user_func_array-expects-parameter-1-to-be-a-valid-callback-3/)
 * Status: not resolved