no twig tags rendering

I should note when I try and (edit a) post I get the following errors:

Warning: array_keys() expects parameter 1 to be array, null given in /home/.../wp-content/plugins/meta-box/inc/sanitizer.php on line 154

Warning: array_intersect(): Expected parameter 2 to be an array, null given in /home/.../wp-content/plugins/meta-box/inc/sanitizer.php on line 154

Warning: Cannot modify header information - headers already sent by (output started at /home/.../wp-content/plugins/meta-box/inc/sanitizer.php:154) in /home/.../wp-includes/pluggable.php on line 1281

I have followed this suggestion, with no output.

But I think I need a bit more explanation.

This code was intended for a view, editions-list, that lists not all posts, but only custom post type, "edition" each of which represents a post about a book. I've created this using MetaBox.

editions-list looks something like this (I've only given the first few fields):

<table>
<tr>
<th></th>
<th>Date</th>
<th>Title</th>
</tr>

{% for post in query.posts %}
<tr>
<td>Detail</td>
<td>{{ post.year }}</td>
<td>{{ post.booktitle }}</td>
</tr>
{% endfor %}
</table>

Type for editions-list is archive.
Location for editions-list is edition Archive.

I then have created a second view, single-book-view, that gives a detailed view of each book.

single-book-view looks something like this (I've only given the first few fields):

<table>
   <tr>
     <td>Year</td>
     <td>{{ post.year }}</td>
   </tr>
   <tr>
      <td>Title</td>
      <td>{{ post.booktitle }}</td>
    </tr>
  </table>

Type for single-book-view is singular.
Location for single-book-view is edition / all

That was this listings view.

And this is the single view:

Views Screen (singular)

Hello,

Done all of this, but it's not working. Here's the loom video:

Loom Share