mysql Failed to restart

just click on Restart MySQL under the WHM but get the error:
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DBI connect('mysql:localhost','root',...) failed: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) at /scripts/restartsrv_mysql line 74 mysql has failed, please contact the sysadmin (result was "Warning, no valid mysql.sock file found.mysql has failed").
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can please anyone tell me whta is this error and how to fix?

thanks a lot

 

 

 

 

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