500 error on Metatag field

That's weird - I'm sorry you're having this problem.

What version of Drupal are you using? What version of PHP is used? Are there any relevant messages in the site logs (dblog)?

Drupal 951 and 952, PHP 8.1.6
No messages in dblog, nothing relevant in server logs. I did by comparison with my dev website modules (enabled/disabled) ;)

Could you please try setting the error reporting (admin/config/development/logging) to "All messages, with backtrace information" and see what it says?

Done. No info displayed apart the 500 error. Nothing in watchdog. Make weeks I'm looking for clue to know what could be the source issue.

When the error is shown is the browser's URL the node/NID/edit page or is it the node's display page?

The other issues are too generic to be related to Metatag's code.

it happen on edit page. When I disable the metatag field from edit form display, the edit mode come back as usual.

Ah, thanks for clarifying.

What is PHP's memory limit set to? How many Metatag submodules have you enabled on the site?

Here,

PHP Version 8.1.6 (plus d'information) Limite de mémoire 2G
Metatag submodules:

Metatag (metatag)                                                 Enabled    8.x-1.22  
  SEO             Metatag: App Links (metatag_app_links)                            Disabled   8.x-1.22  
  SEO             Metatag: Dublin Core (metatag_dc)                                 Enabled    8.x-1.22  
  SEO             Metatag: Dublin Core Advanced (metatag_dc_advanced)               Disabled   8.x-1.22  
  SEO             Metatag Extended Permissions (metatag_extended_perms)             Disabled   8.x-1.22  
  SEO             Metatag: Facebook (metatag_facebook)                              Enabled    8.x-1.22  
  SEO             Metatag: Favicons (metatag_favicons)                              Disabled   8.x-1.22  
  SEO             Metatag: Google Custom Search Engine (CSE) (metatag_google_cse)   Enabled    8.x-1.22  
  SEO             Metatag: Google Plus (metatag_google_plus)                        Disabled   8.x-1.22  
  SEO             Metatag: Hreflang (metatag_hreflang)                              Enabled    8.x-1.22  
  SEO             Metatag: Mobile & UI Adjustments (metatag_mobile)                 Enabled    8.x-1.22  
  SEO             Metatag: Open Graph (metatag_open_graph)                          Enabled    8.x-1.22  
  SEO             Metatag: Open Graph Products (metatag_open_graph_products)        Disabled   8.x-1.22  
  SEO             Metatag: Page Manager (metatag_page_manager)                      Disabled   8.x-1.22  
  SEO             Metatag: Pinterest (metatag_pinterest)                            Disabled   8.x-1.22  
  SEO             Metatag Custom Routes (Paths) (metatag_routes)                    Disabled   8.x-1.22  
  SEO             Metatag: Twitter Cards (metatag_twitter_cards)                    Enabled    8.x-1.22  
  SEO             Metatag: Verification (metatag_verification)                      Enabled    8.x-1.22  
  SEO             Metatag: Views (metatag_views)                                    Disabled   8.x-1.22  
  SEO             Schema.org Metatag Example (schema_article_example)               Disabled   8.x-2.4   
  SEO             Schema.org Metatag (schema_metatag)                               Enabled    8.x-2.4   

How many of the Schema Metatag submodules are enabled? How many meta tags are listed on the reports page (admin/reports/metatag-plugins)? While the report doesn't show yet (#3336142), you can find out by running this line of JavaScript in your browser's console from the reports page: jQuery('#block-gin-content tbody h3').length;

There are a lot !
The page doesn't give number, only a (very long) list with details.

JS give this:

jQuery('#block-gin-content tbody h3').length;
0

This is the url: https://www.provence-formation.fr/

Doh. Sorry, I forgot I was testing locally with the Gin theme.

Try this instead: jQuery('table h3').length;

Also this will show how many (sub)modules are enabled in total: jQuery('table.sticky-enabled').length;

Not better. :/

jQuery('table.sticky-enabled').length;
0
jQuery('table h3').length;
0

Put back the form in the content type and no 500 on edit, but still there on viewing mode for authenticated. So I guess, another module put the mess. For example, the url rewriting doesn't work, and I can't check the box to make it automatic...another weird thing

What admin theme are you using?

Honestly if you have a lot of Metatag submodules (including Schema Metatag ones) it's likely you're running into an out-of-memory error as it builds the field. 📌 Content forms are painfully slow if multiple sub-modules are enabled Needs work is related to this.

You should use the settings page (admin/config/search/metatag/settings) and change which meta tag groups show up for each entity type in the "Entity type / Group Mapping" section.

I added a documentation page about this problem:

• https://www.drupal.org/docs/contributed-modules/metatag/frequently-asked... →

Hopefully this helps.

I'm using Claro for now, perhaps it helps ?
After visiting the admin/config/search/metatag/settings , I unchecked some boxes for the incrimined content type.