helm install docker-registry stable/docker-registry not working

I tried the tutorial https://www.digitalocean.com/community/tutorials/how-to-set-up-a-private-docker-registry-on-top-of-digitalocean-spaces-and-use-it-with-digitalocean-kubernetes, but it is not working.

I did:

$ helm repo update $ helm install docker-registry stable/docker-registry -f chart_values.yaml

And i got:

Error: failed to download “stable/docker-registry” (hint: running helm repo update may help)

Any idea about how can i fix it?