Google Webmaster Tools – http://microformats.org/profile/hatom error

Hi, since June 26th Google Webmaster Tools shows me problems with the structured data of several items of my website. Some of my pictures i have included on my website for partly more than a year now show missing structured data for "author" and "updated". Here are some examples: http://www.shabby-it-yourself.de/?attachment_id=227 http://www.shabby-it-yourself.de/?attachment_id=841 http://www.shabby-it-yourself.de/?attachment_id=236 How can i fix the problem? Thank you and kind regards! Leonie