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No connection could be made because the target machine actively refused it

The foll error is:

"No connection could be made because the target machine actively PDOException: SQLSTATE[HY000] [2002] No connection could be made because the target machine actively refused it. in lock_may_be_available() (line 167 of D:\xampp\htdocs\'domainname'\includes\lock.inc)."

*'domainname' is reffer to your domain name

This error accur in localhost

How to fix: just refresh/restart the MYSQL server
That is a MySQL settings/configuration problem.
Read the MySQL documentation about changing the: my.ini