Hi @mariogarcia1,
Thanks for writing in.
You can check the link below for guide on how to migrate site:
https://theme.co/apex/forum/t/cornerstone-migration/126
In regards to your Revolution slider, first, please try to reinstall your revolution slider.
Next, if still happening, increase your PHP memory allocation.
You can try adding this in your wp-config.php located at the root directory of your site.
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. */
Sometimes, hosting does not allow manual memory allocation. Try to contact them so that you can increase your PHP memory allocation.
If not helping, please share us your admin credentials so we could check your setup closer. Don’t forget to set it in secure mode.
Thanks. 