if ( class_exists('Aesop_Core') ) says false

[viterzbayraku]

I am testing your plugin by FirePHP.
class.backend.php not working because Aesop_Core class not detecting. But AESOP plugin is enabled for me.

    if ( class_exists('Aesop_Core') ){
        FB::info("yes");
    }else{
        FB::info("no");
    }   

It query returning "no"