Install error messages

When doing the install, the following errors appeared - should I be concerned??

Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in Drupal\Core\Extension\ThemeInstaller->install() (line 120 of core/lib/Drupal/Core/Extension/ThemeInstaller.php).
Drupal\Core\Extension\ThemeInstaller->install(Array, 1) (Line: 164)
Drupal\Core\Extension\ThemeHandler->install(Array) (Line: 1557)
install_profile_themes(Array) (Line: 661)
install_run_task(Array, Array) (Line: 539)
install_run_tasks(Array) (Line: 116)
install_drupal(Object) (Line: 44)
Warning: count(): Parameter must be an array or an object that implements Countable in Drupal\Core\Form\FormValidator->doValidateForm() (line 256 of core/lib/Drupal/Core/Form/FormValidator.php).
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 235)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 235)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object, 'install_configure_form') (Line: 119)
Drupal\Core\Form\FormValidator->validateForm('install_configure_form', Array, Object) (Line: 571)
Drupal\Core\Form\FormBuilder->processForm('install_configure_form', Array, Object) (Line: 314)
Drupal\Core\Form\FormBuilder->buildForm('install_configure_form', Object) (Line: 893)
install_get_form('Drupal\Core\Installer\Form\SiteConfigureForm', Array) (Line: 583)
install_run_task(Array, Array) (Line: 539)
install_run_tasks(Array) (Line: 116)
install_drupal(Object) (Line: 44)
Warning: count(): Parameter must be an array or an object that implements Countable in Drupal\Core\Form\FormValidator->doValidateForm() (line 256 of core/lib/Drupal/Core/Form/FormValidator.php).
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 235)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 235)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object, 'install_configure_form') (Line: 119)
Drupal\Core\Form\FormValidator->validateForm('install_configure_form', Array, Object) (Line: 571)
Drupal\Core\Form\FormBuilder->processForm('install_configure_form', Array, Object) (Line: 314)
Drupal\Core\Form\FormBuilder->buildForm('install_configure_form', Object) (Line: 893)
install_get_form('Drupal\Core\Installer\Form\SiteConfigureForm', Array) (Line: 583)
install_run_task(Array, Array) (Line: 539)
install_run_tasks(Array) (Line: 116)
install_drupal(Object) (Line: 44)
Warning: count(): Parameter must be an array or an object that implements Countable in Drupal\Core\Form\FormValidator->doValidateForm() (line 256 of core/lib/Drupal/Core/Form/FormValidator.php).
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 235)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 235)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 235)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object, 'install_configure_form') (Line: 119)
Drupal\Core\Form\FormValidator->validateForm('install_configure_form', Array, Object) (Line: 571)
Drupal\Core\Form\FormBuilder->processForm('install_configure_form', Array, Object) (Line: 314)
Drupal\Core\Form\FormBuilder->buildForm('install_configure_form', Object) (Line: 893)
install_get_form('Drupal\Core\Installer\Form\SiteConfigureForm', Array) (Line: 583)
install_run_task(Array, Array) (Line: 539)
install_run_tasks(Array) (Line: 116)
install_drupal(Object) (Line: 44)
Warning: count(): Parameter must be an array or an object that implements Countable in Drupal\Core\Form\FormValidator->doValidateForm() (line 256 of core/lib/Drupal/Core/Form/FormValidator.php).
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 235)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 235)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object) (Line: 235)
Drupal\Core\Form\FormValidator->doValidateForm(Array, Object, 'install_configure_form') (Line: 119)
Drupal\Core\Form\FormValidator->validateForm('install_configure_form', Array, Object) (Line: 571)
Drupal\Core\Form\FormBuilder->processForm('install_configure_form', Array, Object) (Line: 314)
Drupal\Core\Form\FormBuilder->buildForm('install_configure_form', Object) (Line: 893)
install_get_form('Drupal\Core\Installer\Form\SiteConfigureForm', Array) (Line: 583)
install_run_task(Array, Array) (Line: 539)
install_run_tasks(Array) (Line: 116)
install_drupal(Object) (Line: 44)