Class "Joomla\Plugin\System\Log\Extension\Log" not found

[wirecreative]

We have a site that has this error both on the home page AND the admin login screen (preventing login to the admin area):

Code: Select all

Class "Joomla\Plugin\System\Log\Extension\Log" not found

When I turned on debug with maximum reporting, this was the output:

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Call stack
#	Function	Location
1	()	JROOT/plugins/system/log/services/provider.php:37
2	Joomla\DI\ServiceProviderInterface@anonymous/home.restoring/[clientID]/[clientDomain]/plugins/system/log/services/provider.php:21$a0->{closure}()	JROOT/libraries/vendor/joomla/di/src/ContainerResource.php:182
3	Joomla\DI\ContainerResource->getInstance()	JROOT/libraries/vendor/joomla/di/src/Container.php:96
4	Joomla\DI\Container->get()	JROOT/libraries/src/Extension/ExtensionManagerTrait.php:177
5	Joomla\CMS\Application\CMSApplication->loadExtension()	JROOT/libraries/src/Extension/ExtensionManagerTrait.php:99
6	Joomla\CMS\Application\CMSApplication->bootPlugin()	JROOT/libraries/src/Plugin/PluginHelper.php:232
7	Joomla\CMS\Plugin\PluginHelper::import()	JROOT/libraries/src/Plugin/PluginHelper.php:192
8	Joomla\CMS\Plugin\PluginHelper::importPlugin()	JROOT/libraries/src/Application/CMSApplication.php:744
9	Joomla\CMS\Application\CMSApplication->initialiseApp()	JROOT/libraries/src/Application/SiteApplication.php:635
10	Joomla\CMS\Application\SiteApplication->initialiseApp()	JROOT/libraries/src/Application/SiteApplication.php:226
11	Joomla\CMS\Application\SiteApplication->doExecute()	JROOT/libraries/src/Application/CMSApplication.php:293
12	Joomla\CMS\Application\CMSApplication->execute()	JROOT/includes/app.php:61
13	require_once()	JROOT/index.php:32

The site is on Dreamhost, which has a few site backups with unspecified dates, and restoring them did not help. The site owner claims to have not looked at their site since December, so who knows when this started. Strangely, all of the Akeeba Backup archives made during the last year (there should be 4, made quarterly), also seem to have vanished. So I think we're stuck trying to fix this site rather than restoring a backup (which is how the previous thread about this same error resolved their situation).

My last note on the site is that I updated it from 4.4.8 to 4.4.9 in January this year. I would've made a manual backup right before doing that, but it is nowhere, and tested the site right after the updates to ensure it was working.

Any ideas?

[toivo]

The missing class is defined in the file plugins/system/log/src/Extension/Log.php. If the file is missing, get a copy of Log.php from the installation package of Joomla 4.4.9 and copy it to the folder.

Otherwise, if the file Log.php exists and is accessible, use FTP or the File Manager from your cPanel or a similar page, provided by your host. Delete the file administrator/cache/autoload_psr4.php and access the website. That file maps the PHP classes used by Joomla and third party extensions to physical files in the filesystem and it is created automatically, if it has been deleted.