Magento: Fatal error: Call to a member function getTable() on a non-object

Magento: Fatal error: Call to a member function getTable() on a non-object

Scenario:-

I am getting the fatal error saying:-

Fatal error: Call to a member function getTable() on a non-object in
/var/www/magento/app/code/core/Mage/Core/Model/Mysql4/Collection/Abstract.php
on line 456

This error occurs when I try to browse Configurable product in frontend.
Or, when I try to add Configurable product in backend.

I am using Magento version 1.5.0.1

Cause Solution:-

In my case, the cause of this error was wrongly named file in the following
folder:-

app/code/core/Mage/Catalog/Model/Resource/Eav/Mysql4/Product/Type/Configurable/Attribute/

In this folder, there was a file named Attribute.php0000644. I renamed it
to Attribute.php.

This solved my problem. Now, I am able to browse configurable product and
add such products from admin as well.