Title: Slickr Gallery – Call_User Error
Last modified: August 19, 2016

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# Slickr Gallery – Call_User Error

 *  [vvillanova](https://wordpress.org/support/users/vvillanova/)
 * (@vvillanova)
 * [16 years, 10 months ago](https://wordpress.org/support/topic/slickr-gallery-call_user-error/)
 * When editing a post and click on the “Flickr Photos” link, the window comes up,
   but within it, a “Warning: call_user_func_array()” message appears ([see screenshot of error message here](http://hiremydog.com/temp/slickr_error.png)):
 * Warning: call_user_func_array() [function.call-user-func-array]: First argument
   is expected to be a valid callback, ‘SlickrPlugin::upload_tabs_scripts’ was given
   in /home/thewo32/public_html/hiremydog/wp-includes/plugin.php on line 339
 * Warning: call_user_func_array() [function.call-user-func-array]: First argument
   is expected to be a valid callback, ‘media_admin_css’ was given in /home/thewo32/
   public_html/hiremydog/wp-includes/plugin.php on line 339
 * I have no idea what is causing this.
    – Post options have been changed to /year/
   month/day/ – Lightbox2 is installed and activated – Slickr Gallery’s root folder
   is unchanged (slickr-gallery)
 * Any input is welcome, as I am completely stumped after two days of troubleshooting.
   Thanks.

Viewing 5 replies - 1 through 5 (of 5 total)

 *  [zeroenergyvt](https://wordpress.org/support/users/zeroenergyvt/)
 * (@zeroenergyvt)
 * [16 years, 9 months ago](https://wordpress.org/support/topic/slickr-gallery-call_user-error/#post-1094276)
 * I am having the same problem. It works but the lightbox pop up us ugly and unformatted
   with the error.
 *  [ilkrgz](https://wordpress.org/support/users/ilkrgz/)
 * (@ilkrgz)
 * [16 years, 8 months ago](https://wordpress.org/support/topic/slickr-gallery-call_user-error/#post-1094287)
 * I have same problem. Version is 2.8.2
 * `Warning: call_user_func_array() [function.call-user-func-array]: First argument
   is expected to be a valid callback, 'media_admin_css' was given in .../wp-includes/
   plugin.php on line 339`
 *  [crismdq](https://wordpress.org/support/users/crismdq/)
 * (@crismdq)
 * [16 years, 8 months ago](https://wordpress.org/support/topic/slickr-gallery-call_user-error/#post-1094288)
 * Same problem here. Anyone got a fix?
 *  [Taipa](https://wordpress.org/support/users/taipa/)
 * (@taipa)
 * [16 years, 7 months ago](https://wordpress.org/support/topic/slickr-gallery-call_user-error/#post-1094305)
 * I have the same error. WP 2.8.4, Lightbox2 installed.
 *  [henleylover](https://wordpress.org/support/users/henleylover/)
 * (@henleylover)
 * [16 years, 3 months ago](https://wordpress.org/support/topic/slickr-gallery-call_user-error/#post-1094338)
 * Go to plug-ins editor
    Use the drop down menu and select “slickr gallery plug-
   in Press select
 * Find, in the Slickr. php file (first file on the list) the following two lines
   of code (tip:
    it’s located towards the bottom under function media_upload_content)
 * add_action(‘admin_print_scripts’, array(%$this, ‘upload_tabs_scripts’)):
 * add_action(‘admin_print_scripts’, media_admin_’CSS):
 * Add // to the beginning of each of these lines. so it will look like
 * //add_action(‘admin_print_scripts’, array(%$this, ‘upload_tabs_scripts’)):
 * //add_action(‘admin_print_scripts’, media_admin_’CSS):

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘Slickr Gallery – Call_User Error’ is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 5 replies
 * 6 participants
 * Last reply from: [henleylover](https://wordpress.org/support/users/henleylover/)
 * Last activity: [16 years, 3 months ago](https://wordpress.org/support/topic/slickr-gallery-call_user-error/#post-1094338)
 * Status: not resolved

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