Error

The website encountered an unexpected error. Please try again later.
RuntimeException: Missing $settings['hash_salt'] in settings.php. in Drupal\Core\Site\Settings::getHashSalt() (line 172 of core/lib/Drupal/Core/Site/Settings.php).

Drupal\Core\Site\Settings::getHashSalt() (Line: 100)
Drupal\Core\Session\SessionConfiguration->getUnprefixedName(Object) (Line: 74)
Drupal\Core\Session\SessionConfiguration->getName(Object) (Line: 35)
Drupal\Core\Session\SessionConfiguration->hasSession(Object) (Line: 40)
Drupal\Core\PageCache\RequestPolicy\NoSessionOpen->check(Object) (Line: 37)
Drupal\Core\PageCache\ChainRequestPolicy->check(Object) (Line: 812)
system_form_alter(Array, Object, 'install_select_language_form') (Line: 539)
Drupal\Core\Extension\ModuleHandler->alter('form', Array, Object, 'install_select_language_form') (Line: 836)
Drupal\Core\Form\FormBuilder->prepareForm('install_select_language_form', Array, Object) (Line: 279)
Drupal\Core\Form\FormBuilder->buildForm('Drupal\Core\Installer\Form\SelectLanguageForm', Object) (Line: 948)
install_get_form('Drupal\Core\Installer\Form\SelectLanguageForm', Array) (Line: 1380)
install_select_language(Array) (Line: 695)
install_run_task(Array, Array) (Line: 570)
install_run_tasks(Array, NULL) (Line: 118)
install_drupal(Object) (Line: 48)