License key not getting validated

One of my website is giving error message, while validating the license key.
site: www.arqoubcarpentry.ae

screenshot

Try deleting the key, saving it, then re-entering and saving the key again.

not happening, tried.

Still the problem persist, await your reply.

Can you please create and send admin credentials to charlie[at]athemes.com so I can login and take a look? And include a link to this thread.

Charlie