i was tried to enable compilation and got error. And admin & frontend was not accessable.
its happens with me many time on different site. and then i disable compiler from code.
i made comment below given code in path 'includes/config.php'
But its look ilke temporary solution. want to know why its happen. i mean what if i want to enable compiler. ?
magento Fatal error: require_once(): Failed opening required public_html/medomain/includes/src/../lib/vendor/autoload.php
Even i am not enabling it directly just tried to compile it getting this error.