@FightingSpirit To generate a playlist based on what you like you will need to put a name of a track or artist in the white text box on the website. Do not post any links. Go ahead and type: "Arrival to Earth" for example and see if it works now. Well, at least it works perfectly fine here.
@FightingSpirit This website is in no way affiliated with Spotify so it's unlikely we will be able to help you. What browser do you use? Have you tried to use this website on a different browser? Have you tried to clear your browser's cache?