BOSS Oauth sample code - outdated?

Using the exact code from http://developer.yahoo.com/boss/geo/docs/codeexamples.html#oauth_ruby

I'm getting an error returned:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?><yahoo:error xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" yahoo:uri="http://yahoo.com" xml:lang="en-US"><yahoo:description>Please provide valid credentials. OAuth oauth_problem=&quot;OST_OAUTH_SIGNATURE_INVALID_ERROR&quot;, realm=&quot;yahooapis.com&quot;</yahoo:description><yahoo:detail>Please provide valid credentials. OAuth oauth_problem=&quot;OST_OAUTH_SIGNATURE_INVALID_ERROR&quot;, realm=&quot;yahooapis.com&quot;</yahoo:detail></yahoo:error>

Please help!