Fatal error when activating

I have disabled all plugins and themes and this error keeps happening, I also tried the latest version, dev version and previous versions and it still happens.

I also uploaded via FTP.

Plugin could not be activated because it triggered a fatal error.

Fatal error: Uncaught Error: Call to undefined function mb_strtolower() in /home/glenunga/public_html/demo/wp-content/plugins/mailpoet/vendor-prefixed/nesbot/carbon/src/Carbon/Traits/Date.php:2084 Stack trace: #0 /home/glenunga/public_html/demo/wp-content/plugins/mailpoet/vendor-prefixed/nesbot/carbon/src/Carbon/Traits/Date.php(2219): MailPoetVendor\Carbon\Carbon::singularUnit() #1 /home/glenunga/public_html/demo/wp-content/plugins/mailpoet/lib/Config/Populator.php(652): MailPoetVendor\Carbon\Carbon->__call() #2 /home/glenunga/public_html/demo/wp-content/plugins/mailpoet/lib/Config/Populator.php(180): MailPoet\Config\Populator->scheduleInitialInactiveSubscribersCheck() #3 /home/glenunga/public_html/demo/wp-content/plugins/mailpoet/lib/Config/Activator.php(80): MailPoet\Config\Populator->up() #4 /home/glenunga/public_html/demo/wp-content/plugins/mailpoet/lib/Config/Activator.php(60): MailPoet\Config\Activator->processActivate() #5 /home/glenunga/public_html/demo/wp-content/plugins/mailpoet/lib/Config/Initializer.php(333): MailPoet\Config\Activator->activate() #6 /home/glenunga/public_html/demo/wp-includes/class-wp-hook.php(324): MailPoet\Config\Initializer->runActivator() #7 /home/glenunga/public_html/demo/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #8 /home/glenunga/public_html/demo/wp-includes/plugin.php(517): WP_Hook->do_action() #9 /home/glenunga/public_html/demo/wp-admin/plugins.php(196): do_action() #10 {main} thrown in /home/glenunga/public_html/demo/wp-content/plugins/mailpoet/vendor-prefixed/nesbot/carbon/src/Carbon/Traits/Date.php on line 2084

• This topic was modified 8 months ago by Martin.