ArgumentError: no time information in "0" using ActiveRestClient in rails 4.2.1

I'm trying to use an API as a database for my rails application using ActiveRestClient, but when I try to query from the API I get an ArgumentError: no time information in "0". I don't understand where the call to time.rb is coming from. Any ideas what causes the problem and how I can solve this problem?

Thanks in advance!

This is the code I'm using:

class Db < ActiveRestClient::Base
  base_url "https://Placeholder/api/vtest/"
  get :all, "/customer?apiKey=tester"
  get :find, "/customer/:id?apiKey=tester"

  before_request do |name, request|
    request.headers["Accept"] = "application/json"
    request.headers["User-Agent"] = "random"
  end
end

And this is the error message I'm getting:

ArgumentError: no time information in "0"
    from /home/wouter/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/time.rb:252:in `make_time'
    from /home/wouter/.rvm/rubies/ruby-2.2.2/lib/ruby/2.2.0/time.rb:364:in `parse'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/active_rest_client-1.0.8/lib/active_rest_client/caching.rb:69:in `write_cached_response'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/active_rest_client-1.0.8/lib/active_rest_client/request.rb:162:in `block in call'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/notifications.rb:164:in `block in instrument'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/notifications.rb:164:in `instrument'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/active_rest_client-1.0.8/lib/active_rest_client/request.rb:116:in `call'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/active_rest_client-1.0.8/lib/active_rest_client/mapping.rb:46:in `_call'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/active_rest_client-1.0.8/lib/active_rest_client/mapping.rb:28:in `block in _map_call'
    from (irb):1
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.1/lib/rails/commands/console.rb:110:in `start'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.1/lib/rails/commands/console.rb:9:in `start'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:68:in `console'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/railties-4.2.1/lib/rails/commands.rb:17:in `<top (required)>'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:274:in `require'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:274:in `block in require'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:274:in `require'
    from /home/wouter/projects/NavAds/Test/bin/rails:8:in `<top (required)>'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:268:in `load'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:268:in `block in load'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /home/wouter/.rvm/gems/ruby-2.2.2@global/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:268:in `load'
    from /home/wouter/.rvm/rubies/ruby-2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /home/wouter/.rvm/rubies/ruby-2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'