Access to WP form Plesk

I set up my domain via Enon, then Wordpress Hosting from Plesk, then installed WP within Plesk.
All was working fine. I then installed WPMUDEV pro to help me make the website safer and faster. However have logged into Plesk today and cannot get access to Wordpress.

The website (www.prescientpower.co.uk) is no longer showing.

This is now urgent. Can you help?