Title: Warning: call_user_func_array() – error messages Last modified: June 21, 2017 --- # Warning: call_user_func_array() – error messages * Resolved [topqualitytracey](https://wordpress.org/support/users/topqualitytracey/) * (@topqualitytracey) * [8 years, 11 months ago](https://wordpress.org/support/topic/warning-call_user_func_array-error-messages/) * When I activate the plugin, I get these error messages: * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Simple_Proportions_Field’ does not have a method ‘normalize’ in /data/16/ 1/72/92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp- contact-slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Simple_Proportions_Field’ does not have a method ‘normalize’ in /data/16/ 1/72/92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp- contact-slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize’ in /data/16/1/72/ 92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp-contact- slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Simple_Proportions_Field’ does not have a method ‘normalize’ in /data/16/ 1/72/92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp- contact-slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Dropdown_Pages_Field’ does not have a method ‘normalize’ in /data/16/1/72/ 92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp-contact- slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize’ in /data/16/1/72/ 92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp-contact- slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Simple_Proportions_Field’ does not have a method ‘normalize’ in /data/16/ 1/72/92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp- contact-slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Dropdown_Pages_Field’ does not have a method ‘normalize’ in /data/16/1/72/ 92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp-contact- slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize’ in /data/16/1/72/ 92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp-contact- slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Simple_Proportions_Field’ does not have a method ‘normalize’ in /data/16/ 1/72/92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp- contact-slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize’ in /data/16/1/72/ 92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp-contact- slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Simple_Proportions_Field’ does not have a method ‘normalize’ in /data/16/ 1/72/92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp- contact-slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Dropdown_Pages_Field’ does not have a method ‘normalize’ in /data/16/1/72/ 92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp-contact- slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Simple_Proportions_Field’ does not have a method ‘normalize’ in /data/16/ 1/72/92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp- contact-slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Simple_Proportions_Field’ does not have a method ‘normalize’ in /data/16/ 1/72/92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp- contact-slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Simple_Proportions_Field’ does not have a method ‘normalize’ in /data/16/ 1/72/92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp- contact-slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize’ in /data/16/1/72/ 92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp-contact- slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Simple_Proportions_Field’ does not have a method ‘normalize’ in /data/16/ 1/72/92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp- contact-slider/inc/meta-box/inc/field.php on line 510 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, class‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize’ in /data/16/1/72/ 92/1561255/user/1681499/htdocs/wordpressmigration/wp-content/plugins/wp-contact- slider/inc/meta-box/inc/field.php on line 510 * I am using Themeforest the7 Theme with these plugins: The7 WPBakery Visual Composer The7 Ultimate Addons for Visual Composer The7 Elements ConvertPlug Contact Form 7 Crelly Slider Viewing 3 replies - 1 through 3 (of 3 total) * Plugin Author [WPExperts.io](https://wordpress.org/support/users/wpexpertsio/) * (@wpexpertsio) * [8 years, 11 months ago](https://wordpress.org/support/topic/warning-call_user_func_array-error-messages/#post-9251018) * Hi there! * Similar issue was reported last week. Its actually theme **The7** which conflicts with WordPress Contact Slider. Can you share your theme at support[at]wpepxerts[ dot]io so that we can try to remove this conflict with your theme and make it compatible with theme The7. * Thanks! * Thread Starter [topqualitytracey](https://wordpress.org/support/users/topqualitytracey/) * (@topqualitytracey) * [8 years, 11 months ago](https://wordpress.org/support/topic/warning-call_user_func_array-error-messages/#post-9252423) * What do you mean ‘share’ the theme? Do you want me to send the zip file of the whole theme? Could you please be more specific as to where and how you want me to send this? * Plugin Author [WPExperts.io](https://wordpress.org/support/users/wpexpertsio/) * (@wpexpertsio) * [8 years, 11 months ago](https://wordpress.org/support/topic/warning-call_user_func_array-error-messages/#post-9294477) * Hi there! * We were experimenting WordPress Contact slider with theme the7 and saw the above mentioned conflicts. And while digging for the fix here is what we found from the author of the Meta Box API which we both are using. * [Here you can view the comment of the Meta Box author](https://wordpress.org/support/topic/conflict-with-visual-composer-and-other-fields/#post-8374263) * According to him; * > The errors above come from the custom code of your theme dt-the7. They’re not > in the code of the Meta Box. Please contact the theme author to make that code > compatible with Meta Box. * So you need to contact your theme author to update their meta box API to avoid these sort of conflicts with other plugins using the same Meta Box API. * Let us know if still you have any thing we can help you with. * Thanks! Viewing 3 replies - 1 through 3 (of 3 total) The topic ‘Warning: call_user_func_array() – error messages’ is closed to new replies. * ![](https://ps.w.org/wp-contact-slider/assets/icon-256x256.png?rev=3171432) * [WP Contact Slider – Contact Form Slider Widget](https://wordpress.org/plugins/wp-contact-slider/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-contact-slider/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-contact-slider/) * [Active Topics](https://wordpress.org/support/plugin/wp-contact-slider/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-contact-slider/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-contact-slider/reviews/) * 3 replies * 2 participants * Last reply from: [WPExperts.io](https://wordpress.org/support/users/wpexpertsio/) * Last activity: [8 years, 11 months ago](https://wordpress.org/support/topic/warning-call_user_func_array-error-messages/#post-9294477) * Status: resolved