SublimeLinter-html-tidy swears at what?

Question

HTML

Hello!
Friends, tell me how to be?
Installed SublimeLinter_html_tidy (installed according to the article https://habrahabr.ru/post/262137/ )
I decided to check the code, which I fixed, but now it swears, but I don’t understand the reason and how to fix it ...
Header class and closing Header - shows the presence of an error, but what is it?

<header class="main-head" style="background-image: url(img/header_bg.jpg);">
...
</header>

Indicates if there is an error in the nav tag

<nav class="main-mnu">
...
</nav>

In section:

<section class="homesect section_1" id="s1">
...
</section>

<section class="homesect section_2" id="u2">
...
</section>

<section class="homesect s_dark section_3" id="r3">
...
</section>

<section class="homesect s_gray section_4"> На закрывающий тег этого блока, нет замечаний...