When I try to connect it says {“message”:“Missing Mashape application key. Go to http://docs.mashape.com/api-keys to learn how to get your API application key.”}

even if my code is right (I think);
$args = array( "X-Mashape-Key" => "MYKEYHERE", "Accept" => "application/json" );$r = new HttpRequest(“get”, “https://nijikokun-random-cats.p.mashape.com/random”, $args);$rr = $r->getResponse();

I use a library for httprequest which I am sure it works perfectly.