Hey @Jell92,
Thanks for writing in! This error message could mean that a fatal error has occurred. We recommend that you increase your memory allocated to PHP. To increase it, please edit your wp-config.php file and insert these lines:
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
You can add it before the line
/*That's all, stop editing! Happy Blogging. */
Meanwhile, please go to X > Status. Copy the results and post it in your next reply so that we can check your server settings. You may add the results in a secure note. To know how to create a secure note, please check this out: https://theme.co/apex/forum/t/how-to-get-support/288
We would loved to know if this has work for you. Thank you.