If your content contains a table, you may see this error during accessibility checks:

Table headers are poorly structured

Based on the standard being violated, 1.3.1 Info and Relationships, the cause may be that your table header cells lack scope attributes "to associate header cells and data cells in data tables".

You can add those attributes either directly via the HTML source (if you have access to it), or by editing the table's header cells in the WYSIWYG. For example:

This will add attributes to your <th> elements that look like this example:

<th scope="col">Name</th>
<th scope="col">Number</th>
<th scope="col">Phone</th>
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