Your template path ( layouts/taxonomy/tag.html
) is not valid.
See https://gohugo.io/templates/lookup-order/#examples-layout-lookup-for-taxonomy-pages
If you want to use the same template for all taxonomies, use:
layouts/_default/taxonomy.html
If you want to use a unique template for the tags
taxonomy, use:
layouts/tags/taxonomy.html
In either case, your template should contain something like:
{{ range (.Paginate .Pages).Pages }}
<h2><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></h2>
{{ end }}
{{ template "_internal/pagination.html" . }}