There is a known issue with the FOF library packaged with Akeeba Backup 3.6.4, Akeeba Subscriptions 2.4.1 and Akeeba Release System 2.0.3. The affected versions have been pulled off-line. Please upgrade these components to their latest versions.
If you are using Akeeba Backup Professional and you have enabled the System Restore Points feature you will have to disable the "System - System Restore Points" plugin first. If you do not see that plugin in your system and your site's interface is NOT in English, try searching for "PLG_SRP_TITLE" instead. Disable that plugin and install the latest version of the affected component(s).
If you no longer have access to the affected component's Live Update page, please download the latest version and install it on your site using Extensions, Manage Extensions without uninstalling your existing version.
Nicholas K. Dionysopoulos
Lead Developer and Director
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