我正在尝试自动化与网络应用的某些互动，但是水豚不断抛出这个
{"id":"c0616941-0375-4c42-a6d8-a3a5201c5235","name":"tag_name","args":[3,1]}
{"command_id":"c0616941-0375-4c42-a6d8-a3a5201c5235","error":{"name":"Poltergeist.ObsoleteNode","args":[]}}
Capybara::Poltergeist::ObsoleteNode: Capybara::Poltergeist::ObsoleteNode
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/poltergeist-1.14.0/lib/capybara/poltergeist/node.rb:21:in `rescue in command'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/poltergeist-1.14.0/lib/capybara/poltergeist/node.rb:17:in `command'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/poltergeist-1.14.0/lib/capybara/poltergeist/node.rb:111:in `tag_name'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/capybara-2.13.0/lib/capybara/node/element.rb:258:in `block in tag_name'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/capybara-2.13.0/lib/capybara/node/base.rb:85:in `synchronize'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/capybara-2.13.0/lib/capybara/node/element.rb:258:in `tag_name'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/capybara-2.13.0/lib/capybara/node/element.rb:374:in `inspect'
from C:/Ruby23-x64/bin/irb.cmd:19:in `<main>'
我想抓住这个例外并扔掉它，但是当我尝试的时候
begin
@session.first(:button, 'Save').click
rescue Capybara::Poltergeist::ObsoleteNode
puts "Whoops!"
end
它仍然会抛出异常并且不会打印出来＃8;哎呀！＆＃34;。