Problem with installation

I tried installing with Composer, but Composer throws this error.

Varbase\composer\ScriptHandler::postDrupalScaffoldProcedure

Additional uncaught exception thrown while handling exception.
Original
TypeError: Return value of Doctrine\Common\Annotations\AnnotationRegistry::reset() must be an instance of Doctrine\Common\Annotations\void, none returned in Doctrine\Common\Annotations\AnnotationRegistry::reset() (line 55 of /var/www/html/d8/vendor/doctrine/annotations/lib/Doctrine/Common/Annotations/AnnotationRegistry.php).

Doctrine\Common\Annotations\AnnotationRegistry::reset() (Line: 113)
Drupal\Component\Annotation\Plugin\Discovery\AnnotatedClassDiscovery->getDefinitions() (Line: 86)
Drupal\Component\Plugin\Discovery\DerivativeDiscoveryDecorator->getDefinitions() (Line: 284)
Drupal\Core\Plugin\DefaultPluginManager->findDefinitions() (Line: 175)
Drupal\Core\Plugin\DefaultPluginManager->getDefinitions() (Line: 109)
Drupal\Core\Render\ElementInfoManager->buildInfo('vartheme_admin') (Line: 76)
Drupal\Core\Render\ElementInfoManager->getInfo('form') (Line: 810)
Drupal\Core\Form\FormBuilder->prepareForm('install_select_language_form', Array, Object) (Line: 276)
Drupal\Core\Form\FormBuilder->buildForm('install_select_language_form', Object) (Line: 967)
install_get_form('Drupal\Core\Installer\Form\SelectLanguageForm', Array) (Line: 1392)
install_select_language(Array) (Line: 715)
install_run_task(Array, Array) (Line: 590)
install_run_tasks(Array, NULL) (Line: 125)
install_drupal(Object) (Line: 44)
Additional
TypeError: Return value of Doctrine\Common\Annotations\AnnotationRegistry::reset() must be an instance of Doctrine\Common\Annotations\void, none returned in Doctrine\Common\Annotations\AnnotationRegistry::reset() (line 55 of /var/www/html/d8/vendor/doctrine/annotations/lib/Doctrine/Common/Annotations/AnnotationRegistry.php).

Doctrine\Common\Annotations\AnnotationRegistry::reset() (Line: 113)
Drupal\Component\Annotation\Plugin\Discovery\AnnotatedClassDiscovery->getDefinitions() (Line: 86)
Drupal\Component\Plugin\Discovery\DerivativeDiscoveryDecorator->getDefinitions() (Line: 284)
Drupal\Core\Plugin\DefaultPluginManager->findDefinitions() (Line: 175)
Drupal\Core\Plugin\DefaultPluginManager->getDefinitions() (Line: 109)
Drupal\Core\Render\ElementInfoManager->buildInfo('vartheme_admin') (Line: 76)
Drupal\Core\Render\ElementInfoManager->getInfo('html') (Line: 298)
Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 195)
Drupal\Core\Render\Renderer->render(Array, 1) (Line: 139)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 582)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 140)
Drupal\Core\Render\Renderer->renderRoot(Array) (Line: 66)
Drupal\Core\Render\BareHtmlPageRenderer->renderBarePage(Array, 'Error', 'install_page', Array) (Line: 76)
Drupal\Core\ProxyClass\Render\BareHtmlPageRenderer->renderBarePage(Array, 'Error', 'install_page', Array) (Line: 1073)
install_display_output(Array, Array, Array) (Line: 260)
_drupal_log_error(Array, 1) (Line: 602)
_drupal_exception_handler(Object)

I am using Apache 2 and PHP 7.1.22. I also tried with PHP 7.2.