Fatal error: Call to a member function extended() on a non-object in - magento

Fatal error: Call to a member function extended() on a non-object in /home/wholesal/public_html/lib/Varien/Simplexml/Config.php on line 600
Our magento site is currently down and receiving errors such as this one. We attempted to install an extension and after clicking the install we've been unable to access our site and are getting the error. Any ideas? Below is what line 600 looks like:
public function extended(Varien_Simplexml_Config $config, $overwrite=true)
{
$this->getNode()->extended($config->getNode(), $overwrite);
return $this;
}

Issue could be caused by incorrect file/folder permissions or broken XML structure.
Please check xml-files in app/etc and each custom module located in app/code/local/, app/code/community/ folders

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Magento Fatal error: Call to a member function setAddressFilter() in Address.php on line 431

I have this info after adding any product to cart (loged in or not loged in customers):
Fatal error: Call to a member function setAddressFilter() on a non-object in /home/we201626/public_html/xxx/magento/app/code/core/Mage/Sales/Model/Quote/Address.php on line 431
I don't know what is the reason - I instaled AddThis extention but now I uninstal it and recover my data - I had backup files. It doesn't work after it as well.
What happend?
How to resolve this problem?
Any idea?

Fatal error: Call to a member function setOrder() on a non-object in Magenotification.php

My website developed in magento is running well but when I try to open admin
www.mysite.com/admin
its trowing the following fatal error :
Fatal error: Call to a member function setOrder() on a non-object in
/home/mysite/public_html/app/code/local/Magestore/Magenotification
/Mode/Magenotification.php on line 200
Please help me to solve the problem.?

Fatal error: Call to a member function attributes() on a non-object in \installer\adapter\template.php on line 81

When trying to find and zainstalirovat through the "Extensions Manager" I created a template, and when click "Install", then an error:
"Fatal error: Call to a member function attributes() on a non-object in Z:\home\website.joomla\www\libraries\cms\installer\adapter\template.php on line 81"
Who knows what to do, help please?
Seems like a problem in templateDetails.xml file.
From looking at the source of template adapter seems that you didn't specify extension client attribute (whether template should install for site or administration).
<extension version="3.1" type="template" client="site">

magento PHP Fatal error: Class 'Varien_Data_Tree_Node_Collection'

after moving my mangento installation fromm mywebsite.com/mangento To mywebsite.com
I get an error message:\
my magneto is displaying "Site Down For Maintenance" with white screen
I get an error in my error_log file
PHP Fatal error: Class 'Varien_Data_Tree_Node_Collection' not found in public_html/lib/Varien/Data/Tree.php on line 51
Varien_Data_Tree_Node_Collection make sure this class file collection.php exist is in folder Varien/Data/Tree/Node/Collection.php
Also check its permission.
There is a probability that during upload/Move some files were not uploaded successfully

Fatal error in joomla site?

after uploading a file in joomla site this error come
Fatal error: Cannot call overloaded function for non-object in /webcorp1/www/corpusers/p/u/punjabtourism.gov.in/libraries/joomla/utilities/simplexml.php on line 607
Fatal error: Class 'JLoader' not found in /webcorp1/www/corpusers/p/u/punjabtourism.gov.in/libraries/loader.php on line 161
anybody have solution please help
Disable caching and see if that helps the problem - or, if you're using APC caching, then switch to just simple file caching.

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