Custom module causes an AJAX error

Question

I created a custom module which creates a content type (FAQs) with a paragraph field whose type is FAQ Item (with 2 fields, title and text).

After installing the module, I have a new content type as expected.

I add this new content type (which works), but when I want to add more paragraphs, I get this error.

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↵An AJAX HTTP error occurred.↵HTTP Result Code: 200↵Debugging information follows.↵Path: /node/add/faq?ajax_form=1↵StatusText: OK↵ResponseText:

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Is there any missing configuration the module should provide?

The YAML files are inside faq/config/optional. They have been created from the UI on another site and exported.

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My module files and structure

.info.yml file I have basic info link name, type, description, core_version_requirement and package.

.libraries.yml Am importing a JS file, inside "src-js"

.module is empty, without any php code.

.routing.yml also have basic stuff:

faq:
path: '/faqs'
defaults:
  _controller: 'Drupal\faq\Controller\GetFaqController::getFaq'
  _title: 'FAQs Page'
requirements:
  _permission: 'access content'

Inside config-optional folder I have my YML to create content type, fields and paragraph. Those .yml files I exported from another website where I create all of this and deleted "uuid" line.

Then in my controller I also have basic stuff (for now).

class GetFaqController extends ControllerBase {
public function getFaq() {
    
    echo '<h1>FAQs</h1>';

    return [
        '#title' => 'test'
    ];
}

}

This is my module structure/files.

Have very basic configs, that's why I am a bit lost with this error and what I search online I found same error but it is not related.

It seems something is missing with paragraphs and ajax request to add more.

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I have created another module, this new module only creates a paragraph type with 2 fields (title and text), then I add manually this paragraph to "Article" content type and I get same error.

Another thing I have notice, in a clean drupal site with paragrpahs module installed, when I create a paragraph type manually via backoffice and then add it to any content type works correctly, when I install my module all paragraphs fields stop working and give this error.

If I uninstall my module and delete paragraph type created by my module, other paragraphs type start working again.

Here a repository of my custom module if someone want to test.

https://gitlab.com/drase15/custom-module

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Answer 1

After a lot of digging I just need to change a folder name -.- Changed from "optional" to "install", after that everything works as expected.

Thanks for your help.