Error with RealtimeUpdates: need "app secret signed session"

[arsduo]

Hello,

I'm using Koala 0.9.1 with Rails 3.0.1 and Ruby 1.8.7.
I set up Koala with Rails according to the directions in the wiki.

This works fine:

@updates = Koala::Facebook::RealtimeUpdates.new(:app_id =>
Facebook::APP_ID, :secret => Facebook::SECRET)

But when I type @updates.list_subscriptions, I get the following
error:

Koala::Facebook::APIError: OAuthException: (#15) The method you are
calling must be called with an app secret signed session
from /usr/lib/ruby/gems/1.8/gems/koala-0.9.1/lib/koala/
realtime_updates.rb:81:in api' from /usr/lib/ruby/gems/1.8/gems/koala-0.9.1/lib/koala.rb:72:inapi'
from /usr/lib/ruby/gems/1.8/gems/koala-0.9.1/lib/koala/
realtime_updates.rb:78:in api' from /usr/lib/ruby/gems/1.8/gems/koala-0.9.1/lib/koala/ realtime_updates.rb:74:inlist_subscriptions'
from (irb):2

I get the same when I run @updates.subscribe.

Would someone please explain what this means? I tried creating
@updates with the app_access_token and it didn't make any difference.
What is an "app secret signed session"?

Thanks,

Nick

[nickurban]

Changing application type to HTML5 on the Mobile and Devices tab of the application settings fixed this issue.

[arsduo]

Closing.