Components require attributes prop defined

+1 on this issue since it causes a WSOD with not much detail on which component is missing the definition. SDC documentation states all props are optional so I imagine most won't define attributes since that's just handed down by default.

Full Error: Drupal\Core\Render\Component\Exception\InvalidComponentException: [attributes] String value found, but an object is required in Drupal\Core\Theme\Component\ComponentValidator->validateProps() (line 203 of core/lib/Drupal/Core/Theme/Component/ComponentValidator.php).

Hello,
thank you for reporting this issue.
We need more info to be able to help you.
Generally, those errors occur when components are used in an unexpected way.
Would you tell us, which theme and which components are in your site please, and probably which twig syntax is provoking this bug?
thank you very much in advance,

SDC documentation states all props are optional so I imagine most won't define attributes since that's just handed down by default.

All props are optional but an empty attributes prop is automatically injected in the template by SDC if missing.

That's why you can do {{ attributes.addClass("foo") }} without doing {% set attributes = attributes|default(create_attribute()) %} before

Possibly including a component inside another component without specifying props to pass (inheriting from the current template/component). Possibly not using the attributes array.

This is not clear. Can you show us how you call the component?

Twig's include & embed are not a very good way to embed components, because they don't trigger the SDC render element.

Please use component() function, provided by UIP2, instead.

pattern() function was for UI Patterns 1.x, component(string $component_id, array $slots = [], array $props = []) function is for UI Patterns 2.

We are planning to update the documentation before Christmas: #3480554: Documentation upgrade from v1 to v2

If possible, we also want to trigger the SDC component with include & embed :

• First we try in UI Patterns 2.x: #3449653: [2.0.0-beta5] Replace component() function by native include() function
• Then, we propose a Core fix if it works: #3484580: Trigger SDC render element when using Twig include or embed)