500 error after fresh install of Joomla 4.1.4

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Joomla! Fledgling
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500 error after fresh install of Joomla 4.1.4

Post by annette22 » Wed Jun 15, 2022 2:50 pm

Just installed a brand new Joomla 4.1.4.
DB : Mysql 5.6
Php 8.1

Installed went well, but trying to access the administrator or frontpage lead to Error 500 message.
So I followed the instructions and activated maximum debug.
Here is what I get :
Une erreur est survenue
0 Class "Joomla\Plugin\System\Debug\Storage\FileStorage" not found

Call stack
# Function Location
1 () JROOT/plugins/system/debug/debug.php:196
2 PlgSystemDebug->__construct() JROOT/libraries/src/Extension/ExtensionManagerTrait.php:242
3 Joomla\CMS\Application\CMSApplication->loadPluginFromFilesystem() JROOT/libraries/src/Extension/ExtensionManagerTrait.php:160
4 Joomla\CMS\Application\CMSApplication->loadExtension() JROOT/libraries/src/Extension/ExtensionManagerTrait.php:94
5 Joomla\CMS\Application\CMSApplication->bootPlugin() JROOT/libraries/src/Plugin/PluginHelper.php:236
6 Joomla\CMS\Plugin\PluginHelper::import() JROOT/libraries/src/Plugin/PluginHelper.php:194
7 Joomla\CMS\Plugin\PluginHelper::importPlugin() JROOT/libraries/src/Application/CMSApplication.php:742
8 Joomla\CMS\Application\CMSApplication->initialiseApp() JROOT/libraries/src/Application/AdministratorApplication.php:354
9 Joomla\CMS\Application\AdministratorApplication->initialiseApp() JROOT/libraries/src/Application/AdministratorApplication.php:165
10 Joomla\CMS\Application\AdministratorApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:278
11 Joomla\CMS\Application\CMSApplication->execute() JROOT/administrator/includes/app.php:63
12 require_once() JROOT/administrator/index.php:32
Can you help ? I have no idea of what to do next.

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Joomla! Guru
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Re: 500 error after fresh install of Joomla 4.1.4

Post by ceford » Wed Jun 15, 2022 7:03 pm

Open administrator/cache/autoload_psr4.php with a text editor. Does it contain this line:

Code: Select all

	'Joomla\\Plugin\\System\\Debug\\' => [JPATH_PLUGINS . '/system/debug/src'],
If not, delete this file - Joomla should recreate it on your next page load.

If that does not work, run the Forum Post Assistant and post the results here.

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