site - is currently unable to handle this request Http error 500 - magento

once i clicked on "Proceed to checkout" button, we are getting below error
The sitename.com is't working
www.sitename.co.nz is currently unable to handle this request
Http Error 500
even in backend when we open some orders, than also same error in order-view page.
we have shared hosting.

It was a problem with magento core file cc.php file , one of our devoloper edited it in wrong way, once i replaced the
original file, it worked fine.

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AJAX request terminated abnormally with select photo uploads in Drupal

I'm busy fixing an issue on a site a friend runs for her work. I have worked on this site before, and this is the only Drupal site I have ever worked on, so I am somewhat of a newbie to Drupal. The original dev decided they no longer wanted to maintain it quite some time ago and kind of disappeared shortly after.
The issue:- Most photos upload fine however some cause the following error:
An AJAX HTTP request terminated abnormally. Debugging information follows.
Path: /?q=file/ajax/field_accom_image/und/form--5hp1P7pzFdShaND24CsiI7QNe3f9bApEq9Gu78bRZg
StatusText: n/a
ResponseText: Bad Request Your browser sent a request that this server could not understand. Apache Server at REAL_URL_REDACTED Port 80
ReadyState: undefined
I have found "An AJAX HTTP request terminated abnormally" errors on StackOverflow and the Drupal site, however, none of them had a "ResponseText" of "Bad Request" and a "ReadyState" of "undefined" simultaneously.
This didn't stop me from trying troubleshooting from those answers, such as setting the $base_url variable in settings.php, checking and changing permissions on the server, disable the overlay feature for the admin settings, compressing the image to a smaller file size, dropping the image resolution, removing all possible metadata from the image, checking the upload max file size in the php config.
Drupal version is 7.59

_PS_MODE_DEV_ not working in Prestashop 1.6.1.11

I'm trying to install/configure a theme in a new/clean Prestashop 1.6.1.11 installation. I was able to install/enable the theme, but when I try to view the page it comes back with a 500 error message.
I changed _PS_MODE_DEV_ to true in /config/defines.inc.php but still I only get:
The x.x.x.x page isn’t working
x.x.x.x is currently unable to handle this request.
HTTP ERROR 500
It's not showing the error debug information so that I can troubleshoot.
Anywhere else where I need to enable this?
Thanks
You are not able to view the error even after enabling error debugging because the error is being generated before the error debugging is set to enabled. In order to debug your issues, you can check the error log on your server.
In case of Apache you can check following file:
/var/log/apache2/error.log

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I am developing a component in joomla 2.5, my component sends a request to some url and gets the response object. If i pass wrong url, joomla takes me to the default page of Error : 500 - No response code found . I want that if user install my component and mistakenly they put wrong url , it should show some custom error message/page which should more meaningful to non-programming person rather than taking user to default error page. Is there some way to add this type of functionality in Joomla without editing template/error.php file in core.
You should have an error.php file in your template, if you don't add one and make it look the way you want. also remember that when you turn debugging off you won't get the stack trace etc.
However error 500 indicates something different than that the url does not exist ("wrong URL"), which would be a 404. 500 is an internal server error and you need to check your logs to figure out what is causing it.

Opencart Ajax Error unexpected token <

I'm using OpenCart 1.5.1.3 and having this strange error on Guest Shipping in Ajax. I'm getting the error "Unexpected token <".
I have tried everyting, change the Ajax code, look at the controller, but no luck. You can try it yourself at http://www.biancabonte.nl/shop/. Put something in the cart and checkout Direct instead of registering. Then the problem occurs.
Thanks
This is almost certainly due to an error message being output by your store, which precedes the AJAX JSON content. Check your error logs around the time you made/make the request. While they won't contain the < character since they're not formatted like the ones output by PHP, they will still have the actual message. Your error logs will either be in the SYSTEM > ERROR LOGS in the admin, or in your cpanel/plesk/other control panel under logs usually

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I am making asp.net website in my system using web location File System. i try to browse my localhost website but it cannot be browse in any browser(Firefox,chrome etc). after searching error on google i also made changes in LAN setting of browser but still can't get any result.
In Chrome i am receiving following error
"This webpage is not available
The webpage at http://localhost:2625/Website/Default.aspx might be temporarily down or it may have moved permanently to a new web address.
Error 101 (net::ERR_CONNECTION_RESET): Unknown error."
In Firefox i am receiving following error
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The connection to the server was reset while the page was loading."
How can i resolve this problem ?
i have resolved my problem.
i got help from following link
http://forums.asp.net/t/1437368.aspx

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