You have requested a non-existent [error] service "cache.backend.memcache" Error

exception 'Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException' with message 'You have requested a non-existent [error]
service "cache.backend.memcache". Did you mean one of these: "cache.backend.database", "cache.backend.apcu", "cache.backend.php",
"cache.backend.memory"?' 

I am getting the following error in my error log and "The website encountered an unexpected error. Please try again later." error message on the web interface.

Irrespective of the reason I think there should be exception handling for this.

Raising the priority to critical as it is taking the site down.