Custom module causes an AJAX error 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 &quot;src-js&quot;
.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 &quot;uuid&quot; line.

Then in my controller I also have basic stuff (for now).
class GetFaqController extends ControllerBase {
public function getFaq() {
    
    echo '&lt;h1&gt;FAQs&lt;/h1&gt;';

    return [
        '#title' =&gt; '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 &quot;Article&quot; 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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After a lot of digging I just need to change a folder name -.-
Changed from &quot;optional&quot; to &quot;install&quot;, after that everything works as expected.
Thanks for your help.