Internal server error in opencart checkout - opencart

I have a project running using opencart, and it was working fine. But suddenly when the user moves to entering the credit card information it gives him an internal server error.
When I checked the error log I found the following
2017-04-23 2:49:25 - PHP Notice: Undefined variable: class in D:\home\site\wwwroot\opencartar\catalog\view\theme\customTheme\template\common\success.tpl
on line 32

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CKFinder3 sys_get_temp_dir not working in Linux? using apache 2.4 AWS

I was able to setup working ckeditor/ckfinder plugin on my local
However when I tried to move the project to AWS ckfinder suddenly is not working anymore.
I suspected it's because on the temp directory on config.php
$config['tempDirectory'] = sys_get_temp_dir();
Here's the error on AWS ec2
UPDATE
Invalid Request Error and when I tried to inspect element it says
Invalid request shows up when I try to click this icon

GAE Error | Server Encountered an Error and couldn't complete your request. Please try again after 30 seconds

We have an app running on Google App Engine with Python 2.7 runtime which can be assessed using Google Login, implemented using users API endpoint.
We are getting an error "Server Encountered an Error and couldn't complete your request. Please try again after 30 seconds" whenever user tries to open the web app.. The error is thworn on App Engine side, since the 500 error happens on that line where this call is made 'GET https://appengine.google.com/_ah/conflogin'.
This happens for both mobile(majorly) and web. It shows the same error when we try after the specified time.
However when we clear the browser cookies, cache, history etc etc it starts working. Not sure why. But we cannot users to clear all such stuffs all time as they might loose the information that they browsed.
We tried various cases for login(multiple login, single login, incognito mode) but couldn't figure the root cause of the problem.
Have anyone faced such issues before? If yes please share how you solved it.

When I am running scripts with IE in robot framework, I am getting below error:WebDriverException: Message: Invalid timeout type specified: sessionId

When I am running scripts with IE driver in robot framework, I am getting the below error:
WebDriverException: Message: Invalid timeout type specified: sessionId
Code:
Open Browser ${url} ie
Maximize Browser Window
Input Text ${x_username} ${d_username}
I am using IEDriverServer with version 3.13. Could you please help me why I am getting this error. Same script is working fine with chrome and firefox.
Some people here have similar issue. Seems that IEDriverServer v5.0.0 works. Have you tried?

500 internal server error in back end - Joomla 2.5

I have installed new site in Joomla 2.5 and it was working fine at first,(front end and back end),
but today when I wanted to do some changes in the back end, after I log in to the site, It shows this error:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator to inform of the time the error occurred and of anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
I read some questions that were like my problem,
I made some changes in configuration.php file as below:
$log_path='./logs';
$tmp_path = './tmp';
but it did not work.
Please help me:)

Recaptcha: An internal error occurred

I'm using Recaptcha within Django. I was using the following tutorial to integrate it in my web application: http://www.marcofucci.com/tumblelog/26/jul/2009/integrating-recaptcha-with-django/
The captcha doesn't show up on my machine. Instead of the captcha the following error message is displayed:
An internal error occurred: 4A6376441D250.ADE1949.3546A435
(I get a different code each time).
To which domain did you sign the recaptcha? If you entered "127.0.0.1" in the registration make sure you use this one and not "localhost".
Today, I got this error on one of my client's website.
It was working great but suddenly it stop working. Then upon googling I find this link and renewed my API key.
But after I switched to Secure (SSL Enabled) side of my website then It stops working again.
Then, In I got this function there
recaptcha_get_html(PUBLIC_KEY, $error, true);
The third argumentation use the SSL Server, I've to enable it.
This fixed everything for me.