Fatal error: Uncaught Error: Call to undefined function add_action() in /public_html/krzysztofstory/wp-content/plugins/jetpack-boost/app/modules/optimizations/page-cache/pre-wordpress/Boost_Cache_Actions.php:15 Stack trace: #0 /public_html/krzysztofstory/wp-content/plugins/jetpack-boost/app/modules/optimizations/page-cache/pre-wordpress/Boost_Cache.php(16): require_once() #1 /public_html/krzysztofstory/wp-content/advanced-cache.php(6): require_once('/public_html/kr...') #2 /public_html/krzysztofstory/wp-settings.php(65): include('/public_html/kr...') #3 /public_html/krzysztofstory/wp-config.php(87): require_once('/public_html/kr...') #4 /public_html/krzysztofstory/wp-load.php(37): require_once('/public_html/kr...') #5 /public_html/krzysztofstory/wp-blog-header.php(12): require_once('/public_html/kr...') #6 /public_html/krzysztofstory/index.php(17): require('/public_html/kr...') #7 {main} thrown in /public_html/krzysztofstory/wp-content/plugins/jetpack-boost/app/modules/optimizations/page-cache/pre-wordpress/Boost_Cache_Actions.php on line 15