Warning: Undefined array key "#disabled" in Drupal\address\Element\Country::processCountry() (line 100 of src/Element/Country.php).

I am not able to installed this module due to missing libraries error.

I believe the module has to be installed with Composer → .

Yes, i have installed this module with composer as well, still the same issue.

In version 2.0.3 there is new attributes added but not right.

 '#disabled' => $element['#disabled'],

It must

 '#disabled' => $element['#disabled'] ?? FALSE,

Added MR as per #6, please review.

Does this error persist after a cache clear?

I am asking cause we have #disabled in getInfo() which is used to fill out default keys on an element:

  public function getInfo() {
    $class = get_class($this);
    return [
      // List of country codes. If empty, all countries will be available.
      '#available_countries' => [],

      '#input' => TRUE,
      '#multiple' => FALSE,
      '#default_value' => NULL,
      '#disabled' => FALSE,
      '#process' => [
        [$class, 'processCountry'],
        [$class, 'processGroup'],
      ],
      '#theme_wrappers' => ['container'],
    ];
  }

Merge conflicts must be resolved.

I haven't seen this again since I wrote it so I think a cache clear did do the trick but if it comes back up I'll let ya know!

If anyone's getting this after a cache clear, please holler.

My client is telling me that a CC didn't help; needed the patch.

Back to needing a reroll...