Help Needed to Solve Structured Data Errors


I have a wordpress website. Recently i checked my Google webmaster and saw increase in structures data errors of these kinds:

Data Type: Hatom Source: markup: Items With Error:1608

Further opening it i saw:

Error Type: Missing Update and Missing Author on 4 pages of website.

I have author visible on each post with date too.

How to solve these errors??? Are these errors harmful for my website???

Mani Kunis

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