Edson,
This is a partial installation of Akeeba Backup. Part of the FOF support library did not install completely. Please install Akeeba Backup twice, back to back, without doing anything in between. Do not uninstall, that will cause you to lose your settings and possibly your stored backup archives.
If that does not solve the issue, you will need to download the FOF library from our Downloads page, towards the bottom and install it manually. Note that this library is different than the Joomla! Core FOF library. You need them both.
Dale L. Brackin
Support Specialist
English: native
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!
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My time zone is
EST (UTC -5) (click here to see my current time in Philadelphia, PA)