title: window.googleapis is undefined
body: <p>I am trying to add a G+ +1 button on my web page. I am following the steps provided on <a href="https://developers.google.com/+/plugins/+1button/">Google developers page</a>, but I get the following error <strong>window.googleapis is undefined</strong>. The same error appears even on <a href="https://developers.google.com/+/plugins/+1button/">Google developers page</a> (viewed in Firebug).</p>
  
  <p>Why does this error appear?
  And how can it be solved?</p>