Error when initialize Koala Gem - undefined method `synchronize' for nil:NilClass

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I'm using koala version 2.3.0 + omniauth-facebook 3.0.0

I'm trying to do this:

user_facebook_api = Koala::Facebook::API.new(user_facebook_token) user_facebook_api.get_object("me")

When I try this in the console, it returns my profile correctly.

But on the server, it returns this exception

NoMethodError Exception: undefined method `synchronize' for nil:NilClass


Does anyone know what could be wrong

Full Trace of Server bellow

Already, thanks


Full Trace of Server

/home/nonato/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/singleton.rb:139:in instance' multi_json (1.11.2) lib/multi_json/adapter.rb:21:inload' multi_json (1.11.2) lib/multi_json.rb:119:in load' koala (2.3.0) lib/koala/api.rb:89:inapi' koala (2.3.0) lib/koala/api/graph_api.rb:527:in graph_call' koala (2.3.0) lib/koala/api/graph_api.rb:116:inget_connection' app/controllers/facebook_integrations_controller.rb:86:in `load_facebook_pages'

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