FileRun encounter DB error

Database error: SQLSTATE[HY000] [2002] No such file or directory

Hello to all ; 
Somebody could help me how to fix this .. ??
My server was running ok I dont know what exactly happened

Try to open “system/data/autoconfig.php” in a text editor and change the MySQL configured hostname from “localhost” to “127.0.0.1”. It’s probably a problem with the connection that is attempted via socket.