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We just updated the Data Highlighter troubleshooting guide with more tips and details:

Nice way to finish off the first week of the year :)

More about Data Highlighter:

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Cynthia Coffield's profile photomariette jansen's profile photoPierre Far's profile photo
Hi +mariette jansen We'll make Data Highlighter available for more languages and data types in the months ahead.
Thanks Pierre, this is very helpful. My site returns a "failed to load data" error, and don't yet see troubleshoot for this response. The exact url is an events page already verified in Webmaster Tools. Has anyone else received this error?
I am looking foreward to see it work thx pierre
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