PHP Max Script Execute Time is set to 90, please increase it to 300. Usually this can be changed through cPanel PHP configuration settings.
Also add the following code into your wp-config.php file which can be located in the root of your WordPress installation.
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
You can add the above code, before the following line where it says:
/*That's all, stop editing! Happy Blogging. */
Let us know how it goes.