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How to fix Fatal error: Class ‘Namespace_Module_Helper_Data’ not found error?

The “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.

Following are the steps to resolve”fatal error: Class ‘Namespace_Module_Helper_Data’ not found” error

1. Make sure you install the extension when compilation is disabled in Magento admin.
2. To check whether compilation is enabled or disabled, go to
Admin > system >Tools > compilation check enabled / disabled
3. If enabled, then disable it and install the extension. Once the extension is installed you can enable compilation again by using ‘Re-run Compilation’.
4. If you have already installed the extension & are facing the above error, we will suggest you to disable the extension from app/etc/modules/Namespace_Module.xml by setting –

true 
To
false

Clear cache from var/cache folder.
5. Now you will have the access to Magento admin panel from where you can disable the compilation.
6. Now enable the extension from Namespace_Module.xml file by setting

false
To
true

Clear cache from var/cache folder.

And you are good to go.