Error missing field "updated" and "author"

I search everywhere but my problem seems without solution.
Im using twenty twelve theme as parents theme.
I managed to get rid of the errors for all the posts, but not for the pages.
I tried to change the file function.php in both the parents and child theme, but no success.
i still get this two error:
Error: Missing required field “updated”.
Error: Missing required hCard “author”.

what can I do ???
please, help me with clear instruction, I’m not a programmer and it’s the first time I try to build a website.

Thank you