Webform creates flexbox non stop

When i create or edit a webform camp start a buccle non stop adding layouts flexbox non stop

this is the message in recent registered messages:

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Type php
Fecha Saturday, Mayo 23, 2020 - 09:07
Usuario charly
Location http://localhost/0/admin/structure/webform/manage/confirmacion_asistencia
Referente http://localhost/0/admin/structure/webform
Mensaje Warning: file_get_contents(libraries/jquery.hotkeys/jquery.hotkeys.js): failed to open stream: No such file or directory en Drupal\Core\Asset\JsOptimizer->optimize() (línea 25 de C:\xampp\htdocs\0\core\lib\Drupal\Core\Asset\JsOptimizer.php)
#0 C:\xampp\htdocs\0\core\includes\bootstrap.inc(600): _drupal_error_handler_real(2, 'file_get_conten...', 'C:\\xampp\\htdocs...', 25, Array)
#1 [internal function]: _drupal_error_handler(2, 'file_get_conten...', 'C:\\xampp\\htdocs...', 25, Array)
#2 C:\xampp\htdocs\0\core\lib\Drupal\Core\Asset\JsOptimizer.php(25): file_get_contents('libraries/jquer...')
#3 C:\xampp\htdocs\0\core\lib\Drupal\Core\Asset\JsCollectionOptimizer.php(130): Drupal\Core\Asset\JsOptimizer->optimize(Array)
#4 C:\xampp\htdocs\0\core\lib\Drupal\Core\Asset\AssetResolver.php(297): Drupal\Core\Asset\JsCollectionOptimizer->optimize(Array)
#5 C:\xampp\htdocs\0\core\lib\Drupal\Core\Render\HtmlResponseAttachmentsProcessor.php(322): Drupal\Core\Asset\AssetResolver->getJsAssets(Object(Drupal\Core\Asset\AttachedAssets), true)
#6 C:\xampp\htdocs\0\core\lib\Drupal\Core\Render\HtmlResponseAttachmentsProcessor.php(161): Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAssetLibraries(Object(Drupal\Core\Asset\AttachedAssets), Array)
#7 C:\xampp\htdocs\0\core\modules\big_pipe\src\Render\BigPipeResponseAttachmentsProcessor.php(94): Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments(Object(Drupal\Core\Render\HtmlResponse))
#8 C:\xampp\htdocs\0\core\lib\Drupal\Core\EventSubscriber\HtmlResponseSubscriber.php(45): Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments(Object(Drupal\Core\Render\HtmlResponse))
#9 [internal function]: Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond(Object(Symfony\Component\HttpKernel\Event\FilterResponseEvent), 'kernel.response', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher))
#10 C:\xampp\htdocs\0\core\lib\Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher.php(111): call_user_func(Array, Object(Symfony\Component\HttpKernel\Event\FilterResponseEvent), 'kernel.response', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher))
#11 C:\xampp\htdocs\0\vendor\symfony\http-kernel\HttpKernel.php(191): Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.response', Object(Symfony\Component\HttpKernel\Event\FilterResponseEvent))
#12 C:\xampp\htdocs\0\vendor\symfony\http-kernel\HttpKernel.php(173): Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object(Drupal\Core\Render\HtmlResponse), Object(Symfony\Component\HttpFoundation\Request), 1)
#13 C:\xampp\htdocs\0\vendor\symfony\http-kernel\HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#14 C:\xampp\htdocs\0\core\lib\Drupal\Core\StackMiddleware\Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#15 C:\xampp\htdocs\0\core\lib\Drupal\Core\StackMiddleware\KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#16 C:\xampp\htdocs\0\core\modules\page_cache\src\StackMiddleware\PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#17 C:\xampp\htdocs\0\core\modules\page_cache\src\StackMiddleware\PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#18 C:\xampp\htdocs\0\core\lib\Drupal\Core\StackMiddleware\ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#19 C:\xampp\htdocs\0\core\lib\Drupal\Core\StackMiddleware\NegotiationMiddleware.php(52): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#20 C:\xampp\htdocs\0\vendor\stack\builder\src\Stack\StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#21 C:\xampp\htdocs\0\core\lib\Drupal\Core\DrupalKernel.php(708): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#22 C:\xampp\htdocs\0\index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#23 {main}