Does Ember.RSVP.all.then take 1 or 2 parameters?

I'm creating a function that sends off a bunch of promises and I want to let the user know what happened when they have all resolved. But, I'm not sure what parameters Ember.RSVP.all.then() should take. Right now I have something like this:

Ember.RSVP.all(promises).then(
  (success) ->
    do stuff...
  (error) ->
    handle errors
)

But, I've also seen a pattern like this:

Ember.RSVP.all(promises).then(
  (values) ->
    do stuff...
).catch(
  (values) ->
    handle errors
)

Any clarification on this would be greatly appreciated. Thanks!