Title: Cannot activate rules Last modified: March 16, 2021 --- # Cannot activate rules * [corpat](https://wordpress.org/support/users/corpat/) * (@corpat) * [5 years, 2 months ago](https://wordpress.org/support/topic/cannot-activate-rules/) * I can activate the plugin but once I try to activate one rule I get this error. * Using wordpress 5.7 * ``` [16-Mar-2021 07:13:54 UTC] PHP Fatal error: Uncaught Error: Call to a member function switch_to_locale() on null in /home3/mysite/public_html/wp-includes/l10n.php:1666 Stack trace: #0 /home3/mysite/public_html/wp-admin/includes/misc.php(132): switch_to_locale('sv_SE') #1 /home3/mysite/public_html/wp-content/plugins/http-headers/http-headers.php(1272): insert_with_markers('/home3/mysite...', 'HttpHeaders', Array) #2 /home3/mysite/public_html/wp-content/plugins/http-headers/http-headers.php(755): update_headers_directives() #3 /home3/mysite/public_html/wp-includes/class-wp-hook.php(294): http_headers_option('_transient_time...') #4 /home3/mysite/public_html/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters('', Array) #5 /home3/mysite/public_html/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #6 /home3/mysite/public_html/wp-includes/option.php(626): do_action('added_option', '_transient_time...', 1615878894) #7 /home3/mysite/public_html/wp-includes/option.php(885): add_option('_transient_time...', 1615878894, '', 'no') in /home3/mysite/public_html/wp-includes/l10n.php on line 1666 ``` Viewing 11 replies - 1 through 11 (of 11 total) * Plugin Author [Dimitar Ivanov](https://wordpress.org/support/users/zinoui/) * (@zinoui) * [5 years, 2 months ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14189732) * Hi [@corpat](https://wordpress.org/support/users/corpat/) * Thank you for your bug report. I will try to reproduce and fix it. * [smiley58](https://wordpress.org/support/users/smiley58/) * (@smiley58) * [5 years, 2 months ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14197353) * Hi [@zinoui](https://wordpress.org/support/users/zinoui/) , here the same problem on several pages. Do you need more information to help you find and fix the problem? Regards Boris * Plugin Author [Dimitar Ivanov](https://wordpress.org/support/users/zinoui/) * (@zinoui) * [5 years, 2 months ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14199186) * Hi [@smiley58](https://wordpress.org/support/users/smiley58/) and [@corpat](https://wordpress.org/support/users/corpat/) * After various tests I can’t reproduce this issue. Can I ask you to show the list of plugins you are using. * I’m curious whether both of you using some multilingual plugin. * Thanks * [smiley58](https://wordpress.org/support/users/smiley58/) * (@smiley58) * [5 years, 2 months ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14199258) * ``` Active Plugins All In One WP Security - 4.4.8 By Tips and Tricks HQ, Peter Petreski, Ruhul, Ivy Antispam Bee - 2.9.4 By pluginkollektiv BackWPup - 3.8.0 By Inpsyde GmbH Better Search Replace - 1.3.4 By Delicious Brains Borlabs Cookie - Cookie Opt-in - 2.2.22 By Benjamin A. Bornschein, Borlabs Cache Enabler - 1.6.2 By KeyCDN Classic Editor - 1.6 By WordPress Contributors Elementor - 3.1.4 By Elementor.com Elementor Pro - 3.2.0 By Elementor.com Enable Media Replace - 3.5.0 By ShortPixel Essential Addons for Elementor - 4.5.3 By WPDeveloper Google Analytics for WordPress by MonsterInsights - 7.16.2 By MonsterInsights HSTS Ready - 1.03 By Manu225 Post SMTP - 2.0.22 By Yehuda Hassine Rank Math SEO - 1.0.59.1 By Rank Math Rank Math SEO PRO - 2.3.1 By Rank Math Shariff Wrapper - 4.6.5 By Jan-Peter Lambeck & 3UU ShortPixel Image Optimizer - 4.21.2 By ShortPixel Show Page URL - 1.0.0 By Smarter Websites Wordfence Login Security - 1.0.6 By Wordfence WP Force SSL - 1.57 By WebFactory Ltd ``` * [smiley58](https://wordpress.org/support/users/smiley58/) * (@smiley58) * [5 years, 2 months ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14199261) * hope this helps. if you have any further questions, please contact me. Regards Boris * Thread Starter [corpat](https://wordpress.org/support/users/corpat/) * (@corpat) * [5 years, 2 months ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14199736) * ``` Bluehost Version 2.5.5 Classic Editor Version 1.6 Contact Form 7 Version 5.4 Duplicate Page Version 4.4 Elementor Version 3.1.4 Elementor Pro Version 3.0.6 Google Analytics for WordPress from MonsterInsights Version 7.16.2 Google Tag Manager for WordPress Version 1.11.6 HTTP Headers Version 1.18.1 Password Protected Version 2.4 TablePress Version 1.13 Välj Wordfence Security Version 7.4.14 WordPress Importer Version 0.7 WPML Media Version 2.6.3 WPML Multilingual CMS Version 4.4.9 WPML String Translation Version 3.1.7 WPML Translation Management Version 2.10.5 Yoast SEO Version 16.0.1 ``` * Thread Starter [corpat](https://wordpress.org/support/users/corpat/) * (@corpat) * [5 years, 2 months ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14231942) * Seems like this is the plugins that we share. * Classic Editor Version 1.6 Elementor Version 3.1.4 Elementor Pro Google Analytics for WordPress by MonsterInsights Wordfence Security * Have you been able to reproduce the issue to find a solution? * [smiley58](https://wordpress.org/support/users/smiley58/) * (@smiley58) * [5 years, 2 months ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14242164) * ok, i’m slowly starting to test things out one by one now. so i don’t have to do this on a live site, i’ve installed a local web server. This of course means that the environment is not 100% the same. Elementor (incl. pro) seems to be safe. it may take a few days, i have to do it on the side - This reply was modified 5 years, 2 months ago by [smiley58](https://wordpress.org/support/users/smiley58/). * Thread Starter [corpat](https://wordpress.org/support/users/corpat/) * (@corpat) * [5 years, 1 month ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14292089) * Any findings yet? * [smiley58](https://wordpress.org/support/users/smiley58/) * (@smiley58) * [5 years ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14420088) * unfortunately no, no time at the moment * [Franz](https://wordpress.org/support/users/nauvaro/) * (@nauvaro) * [5 years ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14477518) * Possible conflict with the Indeed Ultimate Affiliate Pro plugin * ``` Uncaught Error: Call to a member function switch_to_locale() on null in /myserver/wp-includes/l10n.php:1666, referer: https://mysite.com/wp-admin/options-general.php?page=http-headers&header=x-frame-options Stack trace:, referer: https://mysite.com/wp-admin/options-general.php?page=http-headers&header=x-frame-options #0 /myserver/wp-admin/includes/misc.php(132): switch_to_locale('pt_BR'), referer: https://mysite.com/wp-admin/options-general.php?page=http-headers&header=x-frame-options #1 /myserver/wp-content/plugins/http-headers/http-headers.php(1330): insert_with_markers('/myserver/...', 'HttpHeaders', Array), referer: https://mysite.com/wp-admin/options-general.php?page=http-headers&header=x-frame-options #2 /myserver/wp-content/plugins/http-headers/http-headers.php(815): update_headers_directives(), referer: https://mysite.com/wp-admin/options-general.php?page=http-headers&header=x-frame-options #3 /myserver/wp-includes/class-wp-hook.php(294): http_headers_option('uap_test_cookie'), referer: https://mysite.com/wp-admin/options-general.php?page=http-headers&header=x-frame-options #4 /myserver/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters('', Array), referer: https://mysite.com/wp-admin/options-general.php?page=http-headers&header=x-frame-options #5 /myserver/wp-includes/plugin.php(484): WP_Hook->do_action(Array), referer: https://mysite.com/wp-admin/options-general.php?page=http-headers&header=x-frame-options #6 /myserver/wp-includes/option.php(486): do_action('updated_option', 'uap_test_cookie', '0', 1), referer: https://mysite.com/wp-admin/options-general.php?page=http-headers&header=x-frame-options #7 /myserver/wp-content/plugins/indeed-affiliate-pro/admin/UapMainAdmin.class.php(253): update_option('uap_test_c in /myserver/wp-includes/l10n.php on line 1666, referer: https://mysite.com/wp-admin/options-general.php?page=http-headers&header=x-frame-options ``` - This reply was modified 5 years ago by [Franz](https://wordpress.org/support/users/nauvaro/). Viewing 11 replies - 1 through 11 (of 11 total) The topic ‘Cannot activate rules’ is closed to new replies. * ![](https://ps.w.org/http-headers/assets/icon-128x128.png?rev=1413576) * [HTTP Headers](https://wordpress.org/plugins/http-headers/) * [Frequently Asked Questions](https://wordpress.org/plugins/http-headers/#faq) * [Support Threads](https://wordpress.org/support/plugin/http-headers/) * [Active Topics](https://wordpress.org/support/plugin/http-headers/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/http-headers/unresolved/) * [Reviews](https://wordpress.org/support/plugin/http-headers/reviews/) * 11 replies * 4 participants * Last reply from: [Franz](https://wordpress.org/support/users/nauvaro/) * Last activity: [5 years ago](https://wordpress.org/support/topic/cannot-activate-rules/#post-14477518) * Status: not resolved