Unrecoverable error occurs when adding default metatag

The more submodules you add, the slower /admin/config/search/metatag/add is.

Found the solution: you uninstall all the submodules and reinstall them afterwards and then it works. But I notice that /admin/config/search/metatag/add becomes slower the more you add submodules.

I'm a little confused by the error - loading the form isn't submitting anything, so it's strange that it says "the uploaded file"? Is that a standard error that your server is configured to display? Are there any errors mentioned in the logs?

The error is likely not from the server but from Drupal. And there are no error in the logs.

Here is the error on the original D11 instance in French. Afterwards, I created another D11 instance in English, only to fix this error.

On the original instance in French, the post_max-size in php.ini was set to 40MB. The new instance has upgraded this value to 128MB.

I ran into the same problem after installing this module. The problem is that it adds so many fields to the form that we go over the max input variables. This can be solved by changing php.ini:

max_input_vars = 20000

Maybe it's advisable to add this to the readme

#12 fixes the issue.

For your information, the very same problem had occurred (on a D11.2.0 instance using PHP 8.4.8) for the metatag_module v2.1.1 and changing the php.ini variable with max_input_vars = 20000 solves the problem.

The advice by @tim_dj to mention this information in the readme is very accurate.

Automatically closed - issue fixed for 2 weeks with no activity.