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I don’t know what the specific problem is. It may be that the pid file has not been deleted, or that pid just corresponds to a running process.
Solution to the problem
1. Delete the pid file and lock file of the httpd service
2. Restart

Or a simple way
If it is a command line
service httpd stop # This step will help you solve some problems
service httpd start # Similar operations

If it is xampp, try stopping first and then starting it

Is it possible that the system comes with apache and conflicts with xampp?

I also encountered the same problem. Because the apache that comes with the system has started up first, just run sudo apachectl stop, and then start xampp.