Critical Error occured

Errordetails:
Database error: Link-ID == false, connect to localhost failed
mysql error: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (111)
mysql error number: 2002
Date: 03.12.2024 @ 17:44
Script: /UltraStats-CoD4/rounds.php?id=dm&start=950
Referer: