[Error] Non-static method Aim\LangHelper::isPageExists() cannot be called statically (0) /home/bitrix/ext_www/ai-academy.ru/local/php_interface/classes/LangHelper.php:154 #0: Aim\LangHelper::getUrlForLang /home/bitrix/ext_www/ai-academy.ru/local/php_interface/classes/LangHelper.php:96 #1: Aim\LangHelper::getLangSwitchLink /home/bitrix/ext_www/ai-academy.ru/local/templates/ai-academy/header.php:156 #2: include_once(string) /home/bitrix/ext_www/ai-academy.ru/bitrix/modules/main/include/prolog_after.php:110 #3: require(string) /home/bitrix/ext_www/ai-academy.ru/bitrix/modules/main/include/prolog.php:11 #4: require_once(string) /home/bitrix/ext_www/ai-academy.ru/bitrix/header.php:1 #5: require(string) /home/bitrix/ext_www/ai-academy.ru/training/index.php:5 ----------