I can't delete unplayable songs

[AnaSombrio]

In November of 2016, I downloaded two songs from Youtube that weren't on Spotify at that time (and aren't noe). I put both of them in a Playlist, while using Spotify on my laptop, but they weren't playable.

I didn't care, however every time I go down in my Library, they appear. And I can't just delete them. I no longer have these songs, because I reseted my computer, but they still appear.

How can I delete them?