An AJAX HTTP error occurred during module installation via UI

The actual error was on the next page:
User error: "data" is an invalid render array key in element_children() (line 6009 of core/includes/common.inc).

http://drupal.org/node/1427826 contains instructions for updating the issue summary with the summary template.

The summary may need to be updated with information from comments.

I'm going to work on updating the issue summary.

update to match core instad of sandbox

Updated issue summary.

Updated issue summary to use template.

added related, maybe duplicate

Tagging

2: drupal-1885788-2.patch queued for re-testing.

Patch no longer applies. From what I can tell this will still be an issue:

function theme_authorize_message($variables) {
  $message = $variables['message'];
  $success = $variables['success'];
  if ($success) {
    $item = array('data' => $message, 'class' => array('authorize-results__success'));
  }
  else {
    $item = array('data' => $message, 'class' => array('authorize-results__failure'));
  }
  return $item;
}

Since a string is still being passed into the data item, rather than an array as the patch above does.

I re-rolled the patch (per instructions: https://www.drupal.org/patch/reroll) and verified that it applies cleanly to HEAD.

This is still an issue, Element::children() still throws an error on this render array as it is returned now. The patch fixes the error.

the issue was verified to still be a problem in #11 and #13. removing the tag.

This issue addresses a major bug and is allowed per https://www.drupal.org/core/beta-changes. Committed 9792a0d and pushed to 8.0.x. Thanks!