Title: Fatal error Last modified: June 20, 2021 --- # Fatal error * [skallerup](https://wordpress.org/support/users/skallerup/) * (@skallerup) * [5 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-3798/) * Getting this error: * `Fatal error: Uncaught Error: Undefined class constant 'MAJOR_VERSION' in /www/ bandageshoppen_564/public/wp-content/plugins/pixel-caffeine/vendor/guzzlehttp/ guzzle/src/Utils.php:118 Stack trace: #0 /www/bandageshoppen_564/public/wp-content/ plugins/pixel-caffeine/vendor/guzzlehttp/guzzle/src/functions.php(71): GuzzleHttp\ Utils::defaultUserAgent() #1 /www/bandageshoppen_564/public/wp-content/plugins/ webshipper-automated-shipping/vendor/guzzlehttp/guzzle/src/Client.php(194): GuzzleHttp\ default_user_agent() #2 /www/bandageshoppen_564/public/wp-content/plugins/webshipper- automated-shipping/vendor/guzzlehttp/guzzle/src/Client.php(75): GuzzleHttp\Client- >configureDefaults(Array) #3 /www/bandageshoppen_564/public/wp-content/plugins/ webshipper-automated-shipping/WebshipperAPI.php(245): GuzzleHttp\Client->__construct()# 4 /www/bandageshoppen_564/public/wp-content/plugins/webshipper-automated-shipping/ WebshipperAPI.php(227): WebshipperAPI->request('https://api.web...', 'post', Array) #5 /www/bandageshoppen_564/public/wp-content/plugi in /www/bandageshoppen_564/ public/wp-content/plugins/pixel-caffeine/vendor/guzzlehttp/guzzle/src/Utils.php on line 118` * Can anyone see what causes this? Viewing 5 replies - 1 through 5 (of 5 total) * Plugin Author [Antonino Scarfì](https://wordpress.org/support/users/antoscarface/) * (@antoscarface) * [5 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-3798/#post-14086088) * Hi, * please, join into this thread where I shared a fixed version of the plugin: [https://wordpress.org/support/topic/php-fatal-error-call-to-undefined-method-guzzlehttppromisecoroutineof/#post-14086044](https://wordpress.org/support/topic/php-fatal-error-call-to-undefined-method-guzzlehttppromisecoroutineof/#post-14086044) * Please, try it and let me know there if it solves for you. Thank you very much! * Plugin Author [Antonino Scarfì](https://wordpress.org/support/users/antoscarface/) * (@antoscarface) * [5 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-3798/#post-14091120) * So, I was finally able to replicate the problem with the WPvivid Backup Plugin and I made some additional fixes to Pixel Caffeine to not interfere with it ( and I hope the other plugins) and it works on my end now. * Please, download Pixel Caffeine again from the following link and try it: [https://www.dropbox.com/s/py8n0oov8jr53yc/pixel-caffeine.fix-guzzle.2.3.0.zip?dl=0](https://www.dropbox.com/s/py8n0oov8jr53yc/pixel-caffeine.fix-guzzle.2.3.0.zip?dl=0) * Let me know if it works for you. * Thread Starter [skallerup](https://wordpress.org/support/users/skallerup/) * (@skallerup) * [5 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-3798/#post-14092141) * Hi Antonino, * Thank you for looking into a fix! * I get this error now: * `Fatal error: Uncaught Error: Class 'PixelCaffeine\Dependencies\Ramsey\Uuid\Uuid' not found in /www/bandageshoppen_564/public/wp-content/plugins/pixel-caffeine/ includes/class-aepc-track.php:81 Stack trace: #0 /www/bandageshoppen_564/public/ wp-content/plugins/pixel-caffeine/includes/class-aepc-pixel-scripts.php(385): AEPC_Track::track('AdvancedEvents', Array) #1 /www/bandageshoppen_564/public/ wp-includes/class-wp-hook.php(287): AEPC_Pixel_Scripts::track_advanced_events('')# 2 /www/bandageshoppen_564/public/wp-includes/class-wp-hook.php(311): WP_Hook- >apply_filters(NULL, Array) #3 /www/bandageshoppen_564/public/wp-includes/plugin. php(484): WP_Hook->do_action(Array) #4 /www/bandageshoppen_564/public/wp-includes/ template-loader.php(13): do_action('template_redire...') #5 /www/bandageshoppen_564/ public/wp-blog-header.php(19): require_once('/www/bandagesho...') #6 /www/bandageshoppen_564/ public/index.php(17): require('/www/bandagesho...') #7 {main} thrown in /www/ bandageshoppen_564/public/wp-content/plugins/pixel-caffeine/includes/class-aepc- track.php on line 81` * I hope this helps? * Plugin Author [Antonino Scarfì](https://wordpress.org/support/users/antoscarface/) * (@antoscarface) * [5 years, 3 months ago](https://wordpress.org/support/topic/fatal-error-3798/#post-14094547) * I’m really sorry, it was my fault! This issue is making me crazy 🙁 * Anyway, I fixed it again (and I hope it’s the last time) in the same previous link, please download and upload it again: [https://www.dropbox.com/s/py8n0oov8jr53yc/pixel-caffeine.fix-guzzle.2.3.0.zip?dl=0](https://www.dropbox.com/s/py8n0oov8jr53yc/pixel-caffeine.fix-guzzle.2.3.0.zip?dl=0) * Let me know, thank you for your patience! * Plugin Author [adespresso](https://wordpress.org/support/users/adespresso/) * (@adespresso) * [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-3798/#post-14190182) * Hi, * we scoped the entire third-party libraries use by Pixel Caffeine within a different own namespace, so it won’t conflict with any other plugin you have installed. * We are releasing the new version of Pixel Caffeine with also this fix, it will be available within the next 24/48 hours. Please be updated as soon as it will be available. Viewing 5 replies - 1 through 5 (of 5 total) The topic ‘Fatal error’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/pixel-caffeine_e2ce0c.svg) * [Pixel Caffeine](https://wordpress.org/plugins/pixel-caffeine/) * [Frequently Asked Questions](https://wordpress.org/plugins/pixel-caffeine/#faq) * [Support Threads](https://wordpress.org/support/plugin/pixel-caffeine/) * [Active Topics](https://wordpress.org/support/plugin/pixel-caffeine/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/pixel-caffeine/unresolved/) * [Reviews](https://wordpress.org/support/plugin/pixel-caffeine/reviews/) ## Tags * [fb pixel](https://wordpress.org/support/topic-tag/fb-pixel/) * 5 replies * 9 participants * Last reply from: [adespresso](https://wordpress.org/support/users/adespresso/) * Last activity: [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-3798/#post-14190182) * Status: not resolved