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Deprecated function: Drupal\bootstrap\Utility\Variables implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in include() (line 576 of vendor/composer/ClassLoader.php).
include('/usr/src/app/drupal-9/core/includes/bootstrap.inc') (Line: 576)
Composer\Autoload\{closure}('/usr/src/app/drupal-9/vendor/composer/../../core/lib/Drupal/Core/Template/Attribute.php') (Line: 427)
Composer\Autoload\ClassLoader->loadClass('Drupal\Core\Template\Attribute') (Line: 1339)
template_preprocess_html(Array, 'html', Array)
call_user_func_array('template_preprocess_html', Array) (Line: 287)
Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 433)
Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 204)
Drupal\Core\Render\Renderer->render(Array, 1) (Line: 148)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 149)
Drupal\Core\Render\Renderer->renderRoot(Array) (Line: 66)
Drupal\Core\Render\BareHtmlPageRenderer->renderBarePage(Array, 'Choose language', 'install_page', Array) (Line: 76)
Drupal\Core\ProxyClass\Render\BareHtmlPageRenderer->renderBarePage(Array, 'Choose language', 'install_page', Array) (Line: 1058)
install_display_output(Array, Array) (Line: 161)
install_drupal(Object) (Line: 48)