Provided the class definition and namespace looks like this...
namespace libs\example;
class Example { ... }
The autoloader should be able to find it.
Note that the default spl_autoload
lowercases the namespaces and class names so your file names and paths should all be lowercase (which you already appear to be doing but just thought I'd mention it).
Also note, for consistency, you should also set the appropriate autoload extensions, eg
spl_autoload_extensions('.php');
spl_autoload_register();