Your folder should look like :

Interface\AddOns\Jamba

Inside the Jamba folder should be

Libs, Locals, Modules, Textures, Binding and so on

If you have Interface\AddOns\Jamba\Jamba you need to move everything from the second Jamba folder into the top level Jamba folder

If you have Interface\AddOns and a bunch of files, you need to create a Jamba folder, delete the Libs, Locales, Modules, textures Bindings, Jamba* files and re-extract them to the Jamba folder.