Title: Metabox Showcase Plugin – Menu Problem
Last modified: August 20, 2016

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# Metabox Showcase Plugin – Menu Problem

 *  [jmutton](https://wordpress.org/support/users/jmutton/)
 * (@jmutton)
 * [14 years, 2 months ago](https://wordpress.org/support/topic/metabox-showcase-plugin-menu-problem/)
 * Hello there,
 * I’m writing a small plugin to track my computer repairs through the wordpress
   admin area.
 * I’m trying to recreate similiar functions of the wordpress dashboard in my own
   plugin. I’m currently using the following: [http://www.code-styling.de/english/how-to-use-wordpress-metaboxes-at-own-plugins](http://www.code-styling.de/english/how-to-use-wordpress-metaboxes-at-own-plugins)
   
   Here is the pastebin of the sourcecode of that plugin. [http://pastebin.com/uTS6jVEK](http://pastebin.com/uTS6jVEK)
 * However I’m trying to edit the following line:
 * `$this->pagehook = add_options_page('Howto Metabox Page Title', "HowTo Metaboxes",'
   manage_options', 'howto_metaboxes', array(&$this, 'on_show_page'));`
 * Into:
 * `add_submenu_page('pctracker_dashboard', 'Dashboard', 'Dashboard', 10, 'pctracker_dashboard','
   pctracker_dashboard');`
 * I’m receiving the following error:
    `Warning: call_user_func_array() expects 
   parameter 1 to be a valid callback, function 'pctracker_dashboard' not found 
   or invalid function name in /home/sites/jmitservices.co.uk/public_html/pctracker/
   wp-includes/plugin.php on line 403`
 * Can anyone help?
    Thanks very much, Jason

Viewing 1 replies (of 1 total)

 *  Thread Starter [jmutton](https://wordpress.org/support/users/jmutton/)
 * (@jmutton)
 * [14 years, 2 months ago](https://wordpress.org/support/topic/metabox-showcase-plugin-menu-problem/#post-2930608)
 * I’ve managed to get it working by moving my menu code into the plugin.
 * [http://pastebin.com/eRHCuuHE](http://pastebin.com/eRHCuuHE)
 * However I’m still getting the following error above the top of the page. (Everything
   works tho!)
 * `Warning: call_user_func_array() expects parameter 1 to be a valid callback, 
   function 'pctracker_dashboard' not found or invalid function name in /home/sites/
   xxxxx.co.uk/public_html/pctracker/wp-includes/plugin.php on line 403`

Viewing 1 replies (of 1 total)

 The topic ‘Metabox Showcase Plugin – Menu Problem’ is closed to new replies.

## Tags

 * [dashboard](https://wordpress.org/support/topic-tag/dashboard/)

 * 1 reply
 * 1 participant
 * Last reply from: [jmutton](https://wordpress.org/support/users/jmutton/)
 * Last activity: [14 years, 2 months ago](https://wordpress.org/support/topic/metabox-showcase-plugin-menu-problem/#post-2930608)
 * Status: not resolved

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