The easiest option to solve these problems in Wordpress CMS are as follows
- Deactivating the plugins that are unused can free up some PHP memory.
Methods for increasing the amount of PHP memory limit:
a. If you have access to your PHP.ini file, change the line in PHP.ini
If your line shows 32M try 128M:
memory_limit = 128M ; Maximum amount of memory a script may consume (128MB)
b. If you don't have access to PHP.ini try adding this to an .htaccess file:
php_value memory_limit 128M
c. Try adding this line to your wp-config.php file:
Increasing memory allocated to PHP
d. Talk to your webhosting webmaster.