What triggers this issue?
This issue reports indexable pages where meta description tag is missing or its value is empty.
Example of an empty meta description tag:
<meta name="description" content="">
Why is it important?
A meta description tag is generally used to inform the search engine with a short, informative summary of what your page is about.
High-quality descriptions can sometimes be displayed in Google's search results as search snippets, helping you get higher click-through rates from SERPs.
In addition, if your page has no specific "og:description" or "twitter:description" tags, the text from the meta description tag will be used when your page is shared on Facebook or Twitter.
How to fix it?
Review the reported pages.
You should provide a unique description for each indexable page on your website to help search engines and people quickly understand what your page is about.
Adding the meta description via Yoast SEO plugin for WordPress:
You can check Google's recommendations on good descriptions.