From Permalinks URLs are set to "Post", and Simple SSL is activated but when I want to create a new page, "Home" for example, and publish I get the "updating failed. the response is not a valid JSON response" error on WordPress. The site is in maintenance mode. How can I fix it?
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Please check the custom shortcodes if you were added any shortcode in your theme function.php file and make sure the shortcode output wrapped with ob_start() and ob_clean() this may causes the error. https://wordpress.stackexchange.com/questions/242769/clean-way-of-using-ob-start-and-ob-end-clean-in-wordpress
Jake
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