I'm running multiple websites and they all produce this error when I clear all cache (this is a Windows server):

PHP Fatal error: Uncaught Error: Call to a member function scanDirectory() on null in C:\******\web\core\lib\Drupal\Core\Asset\CssCollectionOptimizer.php:200
Stack trace:
#0 C:\******\web\modules\contrib\wincachedrupal\src\Asset\CssCollectionOptimizer.php(53): Drupal\Core\Asset\CssCollectionOptimizer->deleteAll()
#1 C:\******\web\core\includes\common.inc(1039): Drupal\wincachedrupal\Asset\CssCollectionOptimizer->deleteAll()
#2 C:\******\web\core\includes\utility.inc(55): drupal_flush_all_caches()
#3 C:\******\vendor\drush\drush\src\Commands\core\CacheCommands.php(204): drupal_rebuild(Object(Composer\Autoload\ClassLoader), Object(Symfony\Component\HttpFoundation\Request))
#4 [internal function]: Drush\Commands\core\CacheCommands->rebuild(Array)
#5 C:\******\vendor\consolidation\annotated-command\src\CommandProcessor.php(257): call_user_func_array(Array, Array)
#6 C:\******\vendor\consolidation\annotated-command\src\C in C:\******\web\core\lib\Drupal\Core\Asset\CssCollectionOptimizer.php on line 200

If anyone could point me in the right direction, that's be great.

My specs:
Drupal 8.8.2
Windows 10
PHP 7.2.25
composer 1.9.3
drush 9

Comments

Olivier_FSU created an issue. See original summary.

Dudelinos’s picture

Dudelinos commented
Title: Serror when calling scanDirectory() on null » Error when calling scanDirectory() on null
longwave’s picture

longwave
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Primary language English
Location UK
commented

Looks like this might be triggered by the "wincachedrupal" module, https://www.drupal.org/project/wincachedrupal ?

avpaderno’s picture

avpaderno
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Primary language Italian
Location Brescia, 🇮🇹 🇪🇺
commented
Version: 8.8.2 » 8.8.x-dev
Dudelinos’s picture

Dudelinos commented

Are you implying updating to the dev version will solves this? I'm not sure I'm comfortable to do that on a production environment.

avpaderno’s picture

avpaderno
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Primary language Italian
Location Brescia, 🇮🇹 🇪🇺
commented

The bug will be fixed in 8.8.x (the Git branch) and later a new release will created. In bug reports, as well as in feature requests and tasks, the issue version is a development snapshot version such as 8.8.x-dev.

Dudelinos’s picture

Dudelinos commented
Version: 8.8.x-dev » 8.8.2
Dudelinos’s picture

Dudelinos commented
Version: 8.8.2 » 8.8.x-dev
Dudelinos’s picture

Dudelinos commented

Ok Thanks, I'll wait for the stable release then. The error doesn't stop me from clearing the cache, even if it's annoying.

Dudelinos’s picture

Dudelinos commented

Ok, I have updated core to 8.8.3 and the issue is still there. At this point, I'm contemplating rebuilding the entire website out of frustration.

rajeevgole’s picture

rajeevgole
He/Him
Primary language English
commented
Project: Drupal core » WinCache Drupal
Version: 8.8.x-dev » 8.x-1.x-dev
Component: base system » Code

I am also facing the same issues.

Drupal 8.8.5
Drupal 7.3

bluegeek9’s picture

bluegeek9 commented

What are the steps to reproduce this bug? Just clear the cache?

It sounds very similair to #2854825: Deprecated function: drupal_realpath. CssCollectionOptimizer and JsCollectionOptimizer were not implementing inheritance correctly, they did not implement a FileSystemInterface. The latest dev release contains the fix.