When some plugin or php code needs more memory than allocated in apache server you get a error like
Fatal error: Allowed memory size of xxxxxx bytes exhausted (tried to allocate xxxxxx bytes) in /home/youruser/public_html/wp-includes/plugin.php on line xxx
To fix this you need increase wordpress memory usage by adding the following line in wp-config.php. This is located in the root of wordpress installation. And you can use FTP client or you can browse the cpanel file manager to edit wp-config and add the code.
define( 'WP_MEMORY_LIMIT', '256M' );
You can increase it to 64M at first and if you still see the error you can increase it to any number it requires but your server has a memory limit available.
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