c2dm_on_rails gem - problem with migrations on Rails 3 ("no such file to load -- gdata (LoadError)")

When I try to do:

$ rails generate c2dm_migrations

I Get:开发者_Python百科

/usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `require': no such file to load -- gdata (LoadError)
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in `require'
...

What's wrong?

PS: I made the same actions with apns_on_rails gem - it was ok.

What's wrong?

It seems, that this gem works with Rails 2 only. And *apns_on_rails* made another developers.