“Allowed memory size” Error

Try to use one of these approaches
1. Edit wp-config.php file and add there:

define('WP_MEMORY_LIMIT', '256M');

2. If you have access to PHP.ini file, change the line in PHP.ini

memory_limit = 256M ;

3. If you don’t have access to PHP.ini try to edit .htaccess file:

php_value memory_limit 256M

4. If none of the above works, please contact your hosting support.