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Invalid command 'LockFile'

Last Updated March 4, 2016

In some situations Apache will fail to start. Running a config test command

apachectl -t

will display this error message

AH00526: Syntax error on line 20 of /private/etc/apache2/extra/httpd-mpm.conf:
Invalid command 'LockFile', perhaps misspelled or defined by a module not included in the server configuration

In that case, it is safe to delete line 20 from that file. Save your changes and try starting Apache again.