Configuration error overnight

[EssentialHonesty]

Goodmorning everyone!

This morning, I wanted to check my inbox and all I got was the following message.

"CONFIGURATION ERROR

config.inc.php was not found.
Please read the INSTALL instructions!"

The thing is, I didn't change anything. This happened overnight. I have been using roundcube for over 6 months now, without any problems.
I don't know anything about servers and server-settings, so be gentle on me..

How can I fix this?

[SKaero]

Someone removed the config or upgrade Roundcube for you.