Double-click ad unit lookup for div failed (DFP error)? <p>Just added double-click DFP ads to a friend's site. Realized that only one of four ads are appearing. Although the status of all 4 ads are "active", 3 are not appearing.</p> <p>I ran the DFP debugger and got this output:</p> <pre><code>Ad unit lookup for div div-gpt-ad-1327994622973-0 failed. Div div-gpt-ad-1327994622973-0 is not mapped to a known ad unit. </code></pre> <p>It doesn't appear to be a javascript issue, but the code for these ads was taken directly from the "generated tags" and these units are active. This occurs in multiple browsers.</p> <p>Could this be a caching issue? How can a cache buster be implemented for ads only? Thanks.</p>