I found that the error was on the plugin td-cloud-library.

I delete the plugin and reinstall and the templates works again.

I have the same problem with a custom post template, the error says:

wp_booster error:
Internal error: The system tried to use an att that does not exists! class_name: td_res_context Att name: "f_auth_nme_font_family" as "f_auth_nme_font_family"
../wordpress/htdocs/wp-content/plugins/td-composer/legacy/common/wp_booster/td_css_res_compiler.php

And editing the template the error is:

Error at zones: 6(models) : 5(dom). The model does not match the content Current state has involved an issue.

• This reply was modified 5 years by owar77. Reason: error on character

I had a similar problem, which did not allow me to save the changes in the panel.

I noticed that the Wordfence plugin was blocking my admin-ajax.php.

By telling the security plugin that this was a valid request, the theme was able to successfully save the changes.

The div code closes correctly, I forgot to copy that part.

I think the error comes from my code calling it from a shortcode. And the TagDiv Composer is also a shortcode on the page.

Could not nest one shortcode inside another.

I solved it by creating a widget bar, and inside that bar I put a ad widget configured with an ad zone, like Sidebar Ad in the theme panel.

And inside the Sidebar Ad I put the shortcode, it works very well, it detects where I am (home, article, tag, editor, etc) and according to that shows the corresponding Google Ad Manager code.

Thanks!!