● Article lacks heading. （記事に見出しがありません）エラー

Article lacks heading. Consider using h2-h6 elements to add identifying headings to all articles.

<article>
    <section>
	    <h2>見出し1</h2>
    </section>
    <section>
        <h3>見出し2</h3>
    </section>
</article>

　↓

<article>
    <h1>見出し</h1>
    <section>
	    <h2>見出し1</h2>
    </section>
    <section>
        <h3>見出し2</h3>
    </section>
</article>