[Koha] koha error

[kenneth rotich]

						Hi all,I am using koha 3.0 and has been running well and all of a certain the following error developed. Can somebody interprete for me the problem and how i can solve it.thanks in advance
ken.
The following fatal error has occurred: 
                        Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) at /opt/koha/src/C4/Context.pm line 646.
Compilation failed in require at /opt/koha/src/C4/Circulation.pm line 25.
BEGIN failed--compilation aborted at /opt/koha/src/C4/Circulation.pm line 25.
Compilation failed in require at /opt/koha/src/C4/Overdues.pm line 24.
BEGIN failed--compilation aborted at /opt/koha/src/C4/Overdues.pm line 24.
Compilation failed in require at /opt/koha/src/C4/Members.pm line 27.
BEGIN failed--compilation aborted at /opt/koha/src/C4/Members.pm line 27.
Compilation failed in require at /opt/koha/src/C4/Auth.pm line 31.
BEGIN failed--compilation aborted at /opt/koha/src/C4/Auth.pm line 31.
Compilation failed in require at /opt/koha/src/mainpage.pl line 23.
BEGIN failed--compilation aborted at /opt/koha/src/mainpage.pl line 23.



      
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