The AdSet is not working

[gukras]

All The AdSet methods are not working,
RestClient::BadRequest: 400 Bad Request
from /home/gaston/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rest-client-2.0.2/lib/restclient/abstract_response.rb:223:in `exception_with_response'
[34] pry(main)> ad.ad_set

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Update:
It works with version 3.0, but the default code in the wiki has 2.10

[kurko]

Broken for me as well