I had installed Apache web server latest in my laptop and after updatation of the conf fil it was working now.
Initially after installtion when I said stop and restart the engine it was working.
When I tested with my .pl and html also it was working.
But when I updated my .pl and said engine restart it says " The requested operatio has failed".
I tried installing twice and both times at this juncture same error. I am not ale to start the engine again.
Can a solution be given for this??

Check your logs. Most likely is a typo or a configuration error in your conf files.

I don't know what distro you are on, but check:

/var/log/syslog
/var/log/apache2/error.log

Tail those logs while starting up the service and that should give you a clue.

Check file permissions too. Apache daemon may not start if file permissions are wrong.

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