I installed OPC and now I'm unable to checkout. So here's what's happening, when I click on "Place Order", the button gets disabled and the page goes nowhere. There is no order saved and the cart is still full.

I checked this in Firefox using the Console and everything happens fine, but it gets stuck at POST http://www.mywebsite.com/onepage/json/saveOrder [HTTP/1.1 500 Internal Server Error 1340ms]

I tried increasing the Memory size to 256M in php.ini, but it still isn't working. Please help. Also disabled all third party extensions.


  • What does OPC stand for one page checkout?
    – SR_Magento
    May 31, 2014 at 10:19
  • One Page Checkout .
    – Ami Kamboj
    May 31, 2014 at 10:36
  • Is it the default module or third party, if 3rd party which one? Have you checked the error logs, if so can you post the contents.
    – SR_Magento
    May 31, 2014 at 11:00
  • 1
    Please have a look in the great debugging tutorial and report back. May 31, 2014 at 11:41
  • 1
    Check your browser's console log and see if there any JS errors. See if the ajax post requests are returning PHP errors in the response.
    – Axel
    May 31, 2014 at 22:55

1 Answer 1


If you get 500 error, the first thing you need to do is to check your apache/nginx/php error logs. There you will find an answer or, at least, a waypoint for further debugging.

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