Problem/Motivation
1.Once I enable layout_discovery module everything is working as expected however once this module is also enabled following errors :
Warning: include_once(/core/modules/layout_discovery/layouts/onecol/templates/theme.inc): Failed to open stream: No such file or directory in include_once() (line 491 of core/lib/Drupal/Core/Theme/Registry.php).
include_once('/core/includes/bootstrap.inc') (Line: 491)
Drupal\Core\Theme\Registry->processExtension(Array, 'field_group_layout', 'module', 'field_group_layout', 'modules/contrib/field_group_layout') (Line: 348)
Drupal\Core\Theme\Registry->Drupal\Core\Theme\{closure}(Object, 'field_group_layout') (Line: 388)
Drupal\Core\Extension\ModuleHandler->invokeAllWith('theme', Object) (Line: 349)
Drupal\Core\Theme\Registry->build() (Line: 247)
Drupal\Core\Theme\Registry->get() (Line: 88)
Drupal\Core\Utility\ThemeRegistry->initializeRegistry() (Line: 69)
Drupal\Core\Utility\ThemeRegistry->__construct('theme_registry:runtime:gin', Object, Object, Array, 1) (Line: 267)
Drupal\Core\Theme\Registry->getRuntime() (Line: 141)
Drupal\Core\Theme\ThemeManager->render(Array, Array) (Line: 445)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 204)
Drupal\Core\Render\Renderer->render(Array, ) (Line: 238)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 592)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 239)
Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 128)
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: 187)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76)
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: 270)
Drupal\shield\ShieldMiddleware->bypass(Object, 1, 1) (Line: 226)
Drupal\shield\ShieldMiddleware->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: 704)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
and
Warning: include_once(): Failed opening '/core/modules/layout_discovery/layouts/onecol/templates/theme.inc' for inclusion (include_path='/vendor/pear/archive_tar:/vendor/pear/console_getopt:/vendor/pear/pear-core-minimal/src:/vendor/pear/pear_exception:.:/opt/alt/php81/usr/share/pear:/opt/alt/php81/usr/share/php:/usr/share/pear:/usr/share/php') in include_once() (line 491 of core/lib/Drupal/Core/Theme/Registry.php).
include_once('/core/includes/bootstrap.inc') (Line: 491)
Drupal\Core\Theme\Registry->processExtension(Array, 'field_group_layout', 'module', 'field_group_layout', 'modules/contrib/field_group_layout') (Line: 348)
Drupal\Core\Theme\Registry->Drupal\Core\Theme\{closure}(Object, 'field_group_layout') (Line: 388)
Drupal\Core\Extension\ModuleHandler->invokeAllWith('theme', Object) (Line: 349)
Drupal\Core\Theme\Registry->build() (Line: 247)
Drupal\Core\Theme\Registry->get() (Line: 88)
Drupal\Core\Utility\ThemeRegistry->initializeRegistry() (Line: 69)
Drupal\Core\Utility\ThemeRegistry->__construct('theme_registry:runtime:gin', Object, Object, Array, 1) (Line: 267)
Drupal\Core\Theme\Registry->getRuntime() (Line: 141)
Drupal\Core\Theme\ThemeManager->render(Array, Array) (Line: 445)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 204)
Drupal\Core\Render\Renderer->render(Array, ) (Line: 238)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 592)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 239)
Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 128)
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: 187)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 76)
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: 270)
Drupal\shield\ShieldMiddleware->bypass(Object, 1, 1) (Line: 226)
Drupal\shield\ShieldMiddleware->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: 704)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)