Title: Critical Error Message (Server 500 errors) Last modified: October 20, 2025 --- # Critical Error Message (Server 500 errors) * Resolved [partyparty](https://wordpress.org/support/users/partyparty/) * (@partyparty) * [7 months, 3 weeks ago](https://wordpress.org/support/topic/critical-error-message-server-500-errors/) * We’re writing because we’re noticing that the WP 2FA plugin is generating a number of 500 errors across multiple websites that we manage. Below is an example of one of the Critical Error messages that WordPress is auto-sending us. We removed the domain name for privacy reasons. * Howdy! WordPress has a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.In this case, WordPress caught an error with one of your plugins, WP 2FA – Two-factor authentication for WordPress.First, visit your website ([https://DOMAIN-REMOVED.com/](https://DOMAIN-REMOVED.com/)) and check for any visible issues. Next, visit the page where the error was caught( [https://DOMAIN-REMOVED.com/wp-admin/profile.php](https://DOMAIN-REMOVED.com/wp-admin/profile.php)) and check for any visible issues.Please contact your host for assistance with investigating this issue further.If your site appears broken and you can’t access your dashboard normally, WordPress now has a special “recovery mode”. This lets you safely login to your dashboard and investigate further.[https://DOMAIN-REMOVED.com/wp-login.php?action=enter_recovery_mode&rm_token=mGENqpxvabcsHI8HMKceSc&rm_key=V5XT6HUzRDKeF12om8c9iN](https://DOMAIN-REMOVED.com/wp-login.php?action=enter_recovery_mode&rm_token=mGENqpxvabcsHI8HMKceSc&rm_key=V5XT6HUzRDKeF12om8c9iN) To keep your site safe, this link will expire in 1 day. Don’t worry about that, though: a new link will be emailed to you if the error occurs again after it expires.When seeking help with this issue, you may be asked for some of the following information:WordPress version 6.8.3Active theme: The7 (version 12.9.2)Current plugin: WP 2FA – Two-factor authentication for WordPress (version 3.0.0)PHP version 8.1.33Error Details=============An error of type E_ERROR was caused in line 40 of the file /home/DOMAIN-REMOVED/public_html/wp-content/plugins/wp-2fa/includes/ classes/bacon/bacon-qr-code/src/Renderer/Image/SvgImageBackEnd.php. Error message: Uncaught WP2FA_Vendor\BaconQrCode\Exception\RuntimeException: You need to install the libxml extension to use this back end in /home/DOMAIN-REMOVED/public_html/ wp-content/plugins/wp-2fa/includes/classes/bacon/bacon-qr-code/src/Renderer/Image/ SvgImageBackEnd.php:40Stack trace:#0 /home/DOMAIN-REMOVED/public_html/wp-content/ plugins/wp-2fa/includes/classes/Authenticator/class-authentication.php(98): WP2FA_Vendor\ BaconQrCode\Renderer\Image\SvgImageBackEnd->__construct()#1 /home/DOMAIN-REMOVED/ public_html/wp-content/plugins/wp-2fa/includes/classes/Admin/Methods/class-totp. php(272): WP2FA\Authenticator\Authentication::get_google_qr_code()#2 /home/DOMAIN- REMOVED/public_html/wp-content/plugins/wp-2fa/includes/classes/Admin/Methods/ class-totp-wizard-steps.php(206): WP2FA\Methods\TOTP::get_qr_code()#3 /home/DOMAIN- REMOVED/public_html/wp-content/plugins/wp-2fa/includes/classes/Admin/Methods/ class-totp-wizard-steps.php(168): WP2FA\Methods\Wizards\TOTP_Wizard_Steps::totp_configure()# 4 /home/DOMAIN-REMOVED/public_html/wp-includes/class-wp-hook.php(324): WP2FA\ Methods\Wizards\TOTP_Wizard_Steps::modal_configure()#5 /home/DOMAIN-REMOVED/public_html/ wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()#6 /home/DOMAIN-REMOVED/ public_html/wp-includes/plugin.php(517): WP_Hook->do_action()#7 /home/DOMAIN- REMOVED/public_html/wp-content/plugins/wp-2fa/includes/classes/Admin/Views/class- wizard-steps.php(380): do_action()#8 /home/DOMAIN-REMOVED/public_html/wp-content/ plugins/wp-2fa/includes/classes/Admin/class-user-profile.php(491): WP2FA\Admin\ Views\Wizard_Steps::show_modal_methods()#9 /home/DOMAIN-REMOVED/public_html/wp- content/plugins/wp-2fa/includes/classes/Admin/class-user-profile.php(382): WP2FA\ Admin\User_Profile::generate_inline_modals()#10 /home/DOMAIN-REMOVED/public_html/ wp-content/plugins/wp-2fa/includes/classes/Admin/class-user-profile.php(614): WP2FA\Admin\User_Profile::user_2fa_options()#11 /home/DOMAIN-REMOVED/public_html/ wp-includes/class-wp-hook.php(324): WP2FA\Admin\User_Profile::inline_2fa_profile_form()# 12 /home/DOMAIN-REMOVED/public_html/wp-includes/class-wp-hook.php(348): WP_Hook- >apply_filters()#13 /home/DOMAIN-REMOVED/public_html/wp-includes/plugin.php(517): WP_Hook->do_action()#14 /home/DOMAIN-REMOVED/public_html/wp-admin/user-edit.php( 884): do_action()#15 /home/DOMAIN-REMOVED/public_html/wp-admin/profile.php(18): require_once(‘/home/DOMAIN-REMOVED…’)#16 {main}  thrown * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fcritical-error-message-server-500-errors%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 1 replies (of 1 total) * Plugin Support [Lucian Padureanu](https://wordpress.org/support/users/lucianwpwhite/) * (@lucianwpwhite) * [7 months, 3 weeks ago](https://wordpress.org/support/topic/critical-error-message-server-500-errors/#post-18688817) * Hello [@partyparty](https://wordpress.org/support/users/partyparty/) ! I am really sorry to hear about this experience! * Based on the error details you shared, this issue is not caused by the plugin itself but by some missing PHP libraries on your server that are required for the 2FA setup to work correctly. We’ve seen this happen before, and reinstalling or enabling the missing PHP modules resolves it. * You can find the full explanation and solution here: [https://wordpress.org/support/topic/2fa-config-failing-on-an-only-admin-user/#post-18657786](https://wordpress.org/support/topic/2fa-config-failing-on-an-only-admin-user/#post-18657786) * Please review that post and check if your server has all the required PHP extensions installed. If not, your hosting provider should be able to enable them for you. We’ll also make sure to include an exception for this error in future releases so that the fatal error will be handled as an exception. Let me know if there are any questions, here to help! Viewing 1 replies (of 1 total) The topic ‘Critical Error Message (Server 500 errors)’ is closed to new replies. * ![](https://ps.w.org/wp-2fa/assets/icon-256x256.png?rev=2961533) * [WP 2FA - Two-factor authentication for WordPress](https://wordpress.org/plugins/wp-2fa/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-2fa/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-2fa/) * [Active Topics](https://wordpress.org/support/plugin/wp-2fa/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-2fa/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-2fa/reviews/) * 1 reply * 2 participants * Last reply from: [Lucian Padureanu](https://wordpress.org/support/users/lucianwpwhite/) * Last activity: [7 months, 3 weeks ago](https://wordpress.org/support/topic/critical-error-message-server-500-errors/#post-18688817) * Status: resolved