Error 503 Encountered on Installation

I encountered an Error 503 on installation.
I’m using CentOS 7 + XAMPP and using Chrome as my browser,
Is anybody having a problem same like me ?
Can anybody provide some help?
Will be really thakful if someone can tell me what to do next.

You need to check your webserver logfiles where you find a more detailed error description (/var/log/{apache,httpd,www}/*)