Fatal error: Uncaught Error: Class "MailPoet\Automation\Integrations\Core\Filters\StringFilter" not found in /htdocs/wp-content/plugins/mailpoet/lib/Automation/Integrations/Core/CoreIntegration.php:34
Stack trace:
#0 /htdocs/wp-content/plugins/mailpoet/lib/Automation/Engine/Engine.php(75): MailPoet\Automation\Integrations\Core\CoreIntegration->register(Object(MailPoet\Automation\Engine\Registry))
#1 /htdocs/wp-content/plugins/mailpoet/lib/Config/Initializer.php(338): MailPoet\Automation\Engine\Engine->initialize()
#2 /htdocs/wp-includes/class-wp-hook.php(310): MailPoet\Config\Initializer->initialize('')
#3 /htdocs/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(NULL, Array)
#4 /htdocs/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#5 /htdocs/wp-settings.php(632): do_action('init')
#6 /htdocs/wp-config.php(96): require_once('/htdocs/wp-sett...')
#7 /htdocs/wp-load.php(50): require_once('/htdocs/wp-conf...')
#8 /htdocs/wp-blog-header.php(13): require_once('/htdocs/wp-load...')
#9 /htdocs/index.php(17): require('/htdocs/wp-blog...')
#10 {main}
thrown in /htdocs/wp-content/plugins/mailpoet/lib/Automation/Integrations/Core/CoreIntegration.php on line 34