我是 twitter API 和 MongoDb 的新手。我正在尝试“MongoDb In Action”一书中的一个 ruby 示例，第 3 章连接到 Twitter 并根据给定的标签获取提要。我已经按照建议完成了红宝石设置。我收到以下异常，我认为这与 ruby 设置有关。任何提示都非常感谢。
/usr/lib/ruby/1.9.1/net/http.rb:762:in `initialize': execution expired (Twitter::Error::ClientError)
from /usr/lib/ruby/1.9.1/net/http.rb:762:in `open'
from /usr/lib/ruby/1.9.1/net/http.rb:762:in `block in connect'
from /usr/lib/ruby/1.9.1/net/http.rb:762:in `connect'
from /usr/lib/ruby/1.9.1/net/http.rb:755:in `do_start'
from /usr/lib/ruby/1.9.1/net/http.rb:744:in `start'
from /usr/lib/ruby/1.9.1/net/http.rb:1284:in `request'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/adapter/net_http.rb:75:in `perform_request'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/adapter/net_http.rb:38:in `call'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/response.rb:8:in `call'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/response.rb:8:in `call'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/response.rb:8:in `call'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/request/url_encoded.rb:14:in `call'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/request/multipart.rb:13:in `call'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter/request/multipart_with_file.rb:14:in `call'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/connection.rb:247:in `run_request'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/connection.rb:112:in `post'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter/client.rb:108:in `request'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter/client.rb:72:in `post'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter/api/utils.rb:82:in `object_from_response'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter/api/oauth.rb:24:in `token'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter/client.rb:96:in `block in request_setup'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/connection.rb:102:in `block in get'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/connection.rb:243:in `block in run_request'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/connection.rb:258:in `block in build_request'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/request.rb:35:in `block in create'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/request.rb:34:in `tap'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/request.rb:34:in `create'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/connection.rb:254:in `build_request'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/connection.rb:239:in `run_request'
from /var/lib/gems/1.9.1/gems/faraday-0.8.7/lib/faraday/connection.rb:100:in `get'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter/client.rb:108:in `request'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter/client.rb:66:in `get'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter/api/utils.rb:82:in `object_from_response'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter/api/search.rb:32:in `search'
from /var/lib/gems/1.9.1/gems/twitter-4.8.1/lib/twitter.rb:60:in `method_missing'
from /home/hadoop/archiver.rb:27:in `save_tweets_for'
from /home/hadoop/archiver.rb:21:in `update'
from update.rb:5:in `block in <main>'
from update.rb:3:in `each'
from update.rb:3:in `<main>'