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I was able to successfully validate (green and no errors) my website at http://www.rainbowriting.com and its three main pages, /index.htm, /index7a.htm and /index9a.htm today several times. Then suddenly, after I made a few changes to the website, but nothing dramatic, the validator service returned that it was reading each of the three pages above as "empty" of anything like content. It returned that one error for each page. Each page had been successfully validating as of earlier today, and there were no major changes.
None of the URLs mentioned have currently any errors so perhaps the issue has been fixed at the target site meanwhile.