Hi @javier-burón-garcía -- can't tell what the error is, since that's a generic Heroku error. Can you try running node app in Heroku console (I think it's called heroku run or something)?
[Solved] YouTube embed not working
You can see it here.
I disabled the plug in, restarted and again activated. No luck
Hope you remember me reporting the same thing in my old NodeBB installation as well.
It seems like you need to add
http://) within the url
Brilliant suggestion @frissdiegurke . Thanks a lot.