I am facing 500 Internal Server Error on /checkout/onepage/saveOrder/form_key/xxxx at the time of clicking place order button at checkout page.
I have found the same issue at this link http://forum.azmagento.com/how-to/500-internal-server-error-on-checkout-onepage-saveorder-redirects-to-cart-without-emptying-71292.html and they have mentioned PHP Memory limit is the problem.
My question is whether this is the apt solution for the issue or any other reason for this issue.
Please help me from this issue..