Fix Articles structured data errors.

Hi, how are you.

I found some errors in google webmaster tools (222 errors). I tried to fix the errors, changing some lines of code, but I was not able to fix them.

The errors occur on Article section.

headline
a value for the headline field is required.
image
a value for the image field is required.
publisher
a value for the publisher field is required.
ldateModified
The DateModified field is recommended. It provides value if available.
mainEntityOfPage
Field Mainenti typeof Page is recommended. It provides value if available.

And in some cases, are other 2 with errors:

author
a value for the author field is required.
name
a value for the name field is required.

All these errors in Article section. In Hentry section I don’t have errors.

I use MX theme, I assume that the errors can happen like with henry error’s.

Thanks in advance.