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I am not able to edit the static blocks, throws an error on click
Fatal error: Class 'Varien_Data_Collection_Filesystem' not found in public_html/app/code/core/Mage/Widget/Model/Widget/Config.php on line 85
When i click on CMS pages it showing like below image
Check whether this file exist in your application.
lib/Varien/Data/Collection/Filesystem.php
If not present, place a fresh copy of that file in that location. You can find one here.
Also check-out this thread and make sure there is no vulnerabilities in your applicaion
