wpml.org on importing new Language gives – Request Entity Too Large

Hi,

I am getting the following message when trying to import a new language into the template.

Request Entity Too Large
The requested resource
/wp-admin/admin.php
does not allow request data with POST requests, or the amount of data provided in the request exceeds the capacity limit.

I have both of the following plug-ins;
WPML Multilingual CMS
WPML String Translation

Activated.

Thank you.