Hi @nezzazvoni,
Did you update Cornerstone too? It should be updated simultaneously to Cornerstone V4.0.4 to avoid incompatibility issues. The domain attached to your latest license needs access so I cannot firm if that’s the case.
If you already updated both and the issue persists, please make sure your site have sufficient memory. Can you try adding the code below in your wp-config.php file located at the root directory of your site.
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
If that doesn’t help, please provide us your wordpress admin login and ftp login in Secure Note(key icon)
