Fatal error: Uncaught SystemException: Undefined store connection in core. in /var/www/php_educationplatform_server/src/site/vendor/festi-team/festi-framework-core/src/Core.php:957 Stack trace: #0 /var/www/php_educationplatform_server/src/site/vendor/festi-team/festi-framework-core/src/plugin/ObjectPlugin.php(86): Core->getObject('Mail', 'Mail', '/var/www/php_ed...') #1 /var/www/php_educationplatform_server/src/site/vendor/festi-team/festi-framework-core/src/plugin/ObjectPlugin.php(27): ObjectPlugin->getObject() #2 /var/www/php_educationplatform_server/src/site/vendor/festi-team/festi-framework-core/src/Core.php(545): ObjectPlugin->onInit() #3 /var/www/php_educationplatform_server/src/dashboard/plugins/MailManager/init.php(9): Core->getPluginInstance('Mail') #4 /var/www/php_educationplatform_server/src/site/vendor/festi-team/festi-framework-core/src/event/EventDispatcher.php(77): Core->{closure}(Object(FestiEvent)) #5 /var/www/php_educationplatform_server/src/site/vendor/festi-team/festi-framework-core/src/Core.php(1147): EventDispatcher->dispatchEvent(Object(FestiEvent)) #6 /var/www/php_educationplatform_server/src/site/vendor/festi-team/festi-framework-core/src/Core.php(167): Core->fireEvent('core_after_init') #7 /var/www/php_educationplatform_server/src/site/vendor/festi-team/festi-framework-core/src/Core.php(101): Core->_onInit() #8 /var/www/php_educationplatform_server/src/site/vendor/festi-team/festi-framework-core/src/util/FestiUtils.php(174): Core::getInstance() #9 /var/www/php_educationplatform_server/src/site/index.php(57): FestiUtils::addLogMessage('PDOException --...', 'site', true) #10 {main} thrown in /var/www/php_educationplatform_server/src/site/vendor/festi-team/festi-framework-core/src/Core.php on line 957