Uncaught PHP Exception Exception: "Only local files should be passed to _locale_parse_js_file()."

I need more information so that I can replicate this issue...

• Is this issue reproducible using simplytest.me?
• What are the steps required to reproduce the issue?
• Is the issue affecting a clean install?

I am receiving the same issue. I hope I can add a little more information.

* I had an existing web form that I had created with Webform 5.0.0-beta4
* I updated from 5.0.0-beta4 to 5.0.0-beta5
* When editing the existing web form I get the error:

The website encountered an unexpected error. Please try again later.

Exception: Only local files should be passed to _locale_parse_js_file(). in _locale_parse_js_file() (line 1141 of core/modules/locale/locale.module).
locale_js_translate(Array) (Line: 503)
locale_js_alter(Array, Object, NULL) (Line: 501)
Drupal\Core\Extension\ModuleHandler->alter('js', Array, Object) (Line: 276)
Drupal\Core\Asset\AssetResolver->getJsAssets(Object, ) (Line: 298)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAssetLibraries(Object, Array) (Line: 161)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments(Object) (Line: 93)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments(Object) (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond(Object, 'kernel.response', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.response', Object) (Line: 184)
Symfony\Component\HttpKernel\HttpKernel->filterResponse(Object, Object, 1) (Line: 166)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 64)
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: 99)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 652)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

I have not tested this with the latest dev version or with a clean install.

To add to this issue, It looks like Drupal is having a hard time loading https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.21.0/codemirror.js. This might be because it is an external resource and may not be loaded properly?

We need to document the steps required to reproduce this issue. I suspect that the locale.module is being enabled.

What version of Drupal are you using?

An immediate work-around is to install all the needed libraries using drush (@see /admin/help/webform#libraries)

I am using Drupal 8.2.6

My apologies. I am having difficulties reproducing the issue on a fresh installation of webform. Installing the libraries locally, using drush webform-libraries-download, does provide a resolution and allows me to edit the webforms.

@chrissnyder I think the patch in #1803330: Add file_exists() to _locale_parse_js_file() to prevent PHP warning might fix the issue.

Any chance, could you break your site by uninstalling the libraries and testing the patch.

Changing to 'Major' since there is a work-around and a patch.

#1803330: Add file_exists() to _locale_parse_js_file() to prevent PHP warning will address this issue and there are two workarounds, apply the recommended patch or install all the required webform libraries.

fyi, this problem is most likely solved by #2872343: CDN delivered libraries are not properly marked as external