Problem/Motivation
After installing theme with 3.x-dev version then error is showing on the front page.
The website encountered an unexpected error. Please try again later.
Twig\Error\SyntaxError: Unknown "endif" tag. in Twig\Parser->subparse() (line 37 of themes\contrib\basic\templates\layout\html.html.twig).
Twig\Parser->parse(Object) (Line: 491)
Twig\Environment->parse(Object) (Line: 519)
Twig\Environment->compileSource(Object) (Line: 131)
Drupal\Core\Template\TwigEnvironment->compileSource(Object) (Line: 351)
Twig\Environment->loadTemplate('__TwigTemplate_b65798f632693a62db0c6c9c2b0b7581', 'themes/contrib/basic/templates/layout/html.html.twig') (Line: 312)
Twig\Environment->load('themes/contrib/basic/templates/layout/html.html.twig') (Line: 53)
twig_render_template('themes/contrib/basic/templates/layout/html.html.twig', Array) (Line: 372)
Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 433)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 204)
Drupal\Core\Render\Renderer->render(Array) (Line: 158)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 159)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
call_user_func(Array, Object, 'kernel.view', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 168)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 74)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 686)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)