how can i fix this error in w3c validation?

Hello, thank you very much for the help.
I have managed to remove the “itemprop” code by disabling schema.org from the Enfold panel.

Currently I have two problems to validate w3c completely:

1) Problems with headers. It is strange because everything has its heading (Section lacks heading, Consider using h2-h6 elements to add identifying headings to all sections.).

2) I think the problem is in the “Color Selection”, but I can not find it (Error: A document must not include more than one visible main element.)

The validation ULR is this: https://validator.w3.org/nu/?doc=http%3A%2F%2Fsaborsur.org%2F

Yes, I have solved it.

1) The problem of the header is solved by putting a header inside each of the text boxes.

2) The next problem I had was that the footer was an included page (according to Enfod options) and that generated two <main> tags. I had to discard this option and put a normal footer.

During the validation I found many problems, but you can solve all of them to finish validating the page. As a recommendation to Kriesi there are several things that should be taken into account:

1) Schema does not validate, you must disable it (Enfold has an option to disable schema)
2) W3c does not allow the <time> tag. I had to edit it by the Child.
3) The javascript giving expression error can be corrected with a code for functions.

Thank you very much for the help anyway.