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Lost connection to MySQL server during query when dumping table

I am facing the following issue what is the solution to fix the issue
-- Connecting to localhost...
mysqldump: Got error: 2002: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) when trying to connect
Dump started for ============whatisca_db=========================
-- Connecting to localhost...
mysqldump: Got error: 2002: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) when trying to connect

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