Fix WordPress error ‘tinyMCE is not defined’1425 admin January 21, 2019 at 4:47 pm (last edited April 12, 2026 at 5:39 am) Append into your wp-config.php file the following line:define('CONCATENATE_SCRIPTS', false); Should be ok thenSimilar Posts:How to fix WordPress error “Sorry, this file type is not permitted for security reasons”WordPress enable force SSL over wp-config.phpWordPress how to disable default wp-cron.php behaviorWordPress wp-config.php settingsHow to fix WordPress Media error Unable to create directory uploads..