Fatal Error Out of memory warning

There are 2 possibilities:

1. A script enters in endless loop until consuming the whole memory

2. Or need to increase your hosting php.ini memory settings

https://www.dailyblogging.org/wordpress/increase-wordpress-memory-limit/

@paopuscher: You’re on 1and1 who is well known for providing very little RAM; ask them for an increase or try adding the ‘define” line below in your wp-config.php file a few lines of white space below the opening <?php in the file:

define('WP_MEMORY_LIMIT', '64M');

@david Choi: 1) possible, but not likely. 2) it’s easier to bump memory in wp-config.php than php.ini