www.mySITE.com is currently unable to handle this request. 500

Question

Magento 1.9.1.0

Something happened and customers are getting the following Error when clicking on the CHECK-OUT button:

The www.mySITE.com page isn’t working

www.mySITE.com is currently unable to handle this request.
500

I suspect this has to do with some kind of an upgrade I bet my hosting provider (HostForWeb) did.

What are the correct versions (requirements) of pHp, mySQL and Apache for Magento 1.9.1.0?

Any other ideas as to what might be causing this?

Answer 1

This is a server error. if you have a developer store, please go to index.php under your root magento store and enable developer mode. Just paste this code after line 72 Mage::setIsDeveloperMode(true); and uncomment ini_set('display_errors', 1); if it is commented. Then you are able to view the error and can research for it on google or can comment here.