Warning: file_get_contents(modules/cern_display_formats/assets/js/event-grid.js): failed to open stream: No such file or directory in _locale_parse_js_file() in Events Grid

Summary

When rendering an Event Grid, the following warning message shows up in the message board:

Warning: file_get_contents(modules/cern_display_formats/assets/js/event-grid.js): failed to open stream: No such file or directory in _locale_parse_js_file() (line 1133 of core/modules/locale/locale.module).

_locale_parse_js_file('modules/cern_display_formats/assets/js/event-grid.js') (Line: 547)
locale_js_translate(Array) (Line: 507)
locale_js_alter(Array, Object, NULL) (Line: 539)
Drupal\Core\Extension\ModuleHandler->alter('js', Array, Object) (Line: 276)
Drupal\Core\Asset\AssetResolver->getJsAssets(Object, ) (Line: 322)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAssetLibraries(Object, Array) (Line: 161)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond(Object, 'kernel.response', Object)
call_user_func(Array, Object, 'kernel.response', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.response', Object) (Line: 191)
Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object, Object, 1) (Line: 173)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
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: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 694)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Possible fixes

This is caused due to the events-grid.js reference in the .libraries file. Check also for other not existing files