How to Deal with Magento Fatal Error?

Most of the time you will get this fatal error  “fatal error: Class ‘Namespace_Module_Helper_Data’ not found” usually occurs after installing the third party extensions, in admin panel with a blank screen. This error occurs when the compilation is enabled while installing the 3rd party extension. If you have added extension without disabling the compilation it may cause this problem.

Step-1:- To check whether compilation is enabled or disabled,
Go to Admin > system >Tools > compilation check enabled / disabled

Step-2:-If enabled, then disable it and install the extension. Once the extension is installed you can enable compilation again by using ‘Re-run Compilation

Step-3:-If you have already installed the extension & are facing the above error, Disable the extension from app/etc/modules/Namespace_Module.xml

<active>true</active> 
To
<active>false</active>

Step-4:-Clear cache from var/cache folder.

Step-5:-Now you will have the access to Magento admin panel from where you can disable the compilation.

Step-6:-Now enable the extension from Namespace_Module.xml

<active>false</active> 
To
<active>true</active>

Step-7:-Clear cache from var/cache folder.

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