Error message

• Notice: Trying to access array offset on value of type int in Drupal\Core\Render\Element::property() (line 27 of core/lib/Drupal/Core/Render/Element.php).
• Notice: Trying to access array offset on value of type int in Drupal\Core\Render\Element::property() (line 27 of core/lib/Drupal/Core/Render/Element.php).
• Notice: Trying to access array offset on value of type int in Drupal\Core\Render\Element::property() (line 27 of core/lib/Drupal/Core/Render/Element.php).
• Notice: Trying to access array offset on value of type int in Drupal\Core\Render\Element::property() (line 27 of core/lib/Drupal/Core/Render/Element.php).
• Notice: Trying to access array offset on value of type int in Drupal\Core\Render\Element::property() (line 27 of core/lib/Drupal/Core/Render/Element.php).
• Notice: Trying to access array offset on value of type int in Drupal\Core\Render\Element::property() (line 27 of core/lib/Drupal/Core/Render/Element.php).
• Notice: Trying to access array offset on value of type int in Drupal\Core\Render\Element::property() (line 27 of core/lib/Drupal/Core/Render/Element.php).
• Notice: Trying to access array offset on value of type int in Drupal\Core\Render\Element::property() (line 27 of core/lib/Drupal/Core/Render/Element.php).
• Notice: Trying to access array offset on value of type int in Drupal\Core\Render\Element::property() (line 27 of core/lib/Drupal/Core/Render/Element.php).
• Notice: Trying to access array offset on value of type int in Drupal\Core\Render\Element::property() (line 27 of core/lib/Drupal/Core/Render/Element.php).