Title: Problem when activating plugin Last modified: November 21, 2016 --- # Problem when activating plugin * [andantesash](https://wordpress.org/support/users/andantesash/) * (@andantesash) * [9 years, 6 months ago](https://wordpress.org/support/topic/problem-when-activating-plugin/) * I have downloaded the plugin and when I activate it I get all these errors on my admin dashboard. How do I fix this and stop them appearing at the top of every page in my admin panel. * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize_field’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 412 * Warning: call_user_func() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in /wp-content/plugins/wp-property/ vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Dropdown_Pages_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize_field’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 412 * Warning: call_user_func() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in /wp-content/plugins/wp-property/ vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Dropdown_Pages_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize_field’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 412 * Warning: call_user_func() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in /wp-content/plugins/wp-property/ vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize_field’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 412 * Warning: call_user_func() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in /wp-content/plugins/wp-property/ vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Dropdown_Pages_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize_field’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 412 * Warning: call_user_func() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in /wp-content/plugins/wp-property/ vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Simple_Proportions_Field’ does not have a method ‘add_actions’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘ RWMB_Fancy_Category_Field’ does not have a method ‘normalize_field’ in /wp-content/ plugins/wp-property/vendor/plugins/wp-meta-box/inc/meta-box.php on line 412 * Warning: call_user_func() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in /wp-content/plugins/wp-property/ vendor/plugins/wp-meta-box/inc/meta-box.php on line 80 Viewing 6 replies - 1 through 6 (of 6 total) * [Elena](https://wordpress.org/support/users/lena60942/) * (@lena60942) * [9 years, 6 months ago](https://wordpress.org/support/topic/problem-when-activating-plugin/#post-8464141) * Hello, * Looks like you have Metabox plug-in, to install WP-Property you would need to deactivate Meta box and activate WP-Property. That should solve the problem. * Let us know if you have questions 🙂 * Thread Starter [andantesash](https://wordpress.org/support/users/andantesash/) * (@andantesash) * [9 years, 6 months ago](https://wordpress.org/support/topic/problem-when-activating-plugin/#post-8471675) * What? The meta-box is part of the wp-property plugin? Not one I installed. If you look carefully at the folder listings you’ll see meta-box is part of your wp-property plugin. * How do I fix this issue? * [Elena](https://wordpress.org/support/users/lena60942/) * (@lena60942) * [9 years, 6 months ago](https://wordpress.org/support/topic/problem-when-activating-plugin/#post-8477161) * Hello, * Yes, but if you have another plug-in Metabox installed the plug-ins will conflict. Could you follow these steps to troubleshoot: [http://feedback.usabilitydynamics.com/knowledgebase/articles/650710-first-steps-to-investigate-any-issue](http://feedback.usabilitydynamics.com/knowledgebase/articles/650710-first-steps-to-investigate-any-issue) * Let me know if you have problems. * Thread Starter [andantesash](https://wordpress.org/support/users/andantesash/) * (@andantesash) * [9 years, 6 months ago](https://wordpress.org/support/topic/problem-when-activating-plugin/#post-8478508) * Doesn’t work with The7 theme or Visual Composer, duplicate post or post type plugins. * This has to be the only plugin I have come across that doesn’t work so many different plugins or themes. * Please advise how to fix this * [Elena](https://wordpress.org/support/users/lena60942/) * (@lena60942) * [9 years, 6 months ago](https://wordpress.org/support/topic/problem-when-activating-plugin/#post-8493161) * Hello, * We are actually working on a fix for this problem, it is just hard to predict all styling and functionality as all these products are written with the help of different programs. * Let me know if you have questions, other than that if you are a developer you would need to tweak with some styles. * [thepixelsedge](https://wordpress.org/support/users/thepixelsedge/) * (@thepixelsedge) * [9 years, 5 months ago](https://wordpress.org/support/topic/problem-when-activating-plugin/#post-8611242) * Hi, I’m having the same problem with the same theme. I’m curious if you found a fix and if so what was it? Viewing 6 replies - 1 through 6 (of 6 total) The topic ‘Problem when activating plugin’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/wp-property_c36510.svg) * [WP-Property - WordPress Powered Real Estate and Property Management](https://wordpress.org/plugins/wp-property/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-property/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-property/) * [Active Topics](https://wordpress.org/support/plugin/wp-property/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-property/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-property/reviews/) * 6 replies * 3 participants * Last reply from: [thepixelsedge](https://wordpress.org/support/users/thepixelsedge/) * Last activity: [9 years, 5 months ago](https://wordpress.org/support/topic/problem-when-activating-plugin/#post-8611242) * Status: not resolved