Error message

• Notice: Undefined variable: current_path in include_once() (line 48 of themes/solid/solid.theme).
• Notice: Undefined index: #type in Drupal\Core\Form\FormHelper::processStates() (line 208 of core/lib/Drupal/Core/Form/FormHelper.php).
• Notice: Undefined offset: 1 in solid_preprocess_html() (line 46 of themes/solid/solid.theme).