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Latest post by nicholas on Thursday, 01 June 2023 09:29 CDT
Hello,
After restoring the wesite, I occurred the following error message
Class "Joomla\Plugin\Content\Fields\Extension\Fields" not found
and I cant access to administrator web page :
Class "Joomla\Plugin\Authentication\Joomla\Extension\Joomla" not found
Regards
You restored a Joomla 4 site on top of a Joomla 3 site. Please read the relevant documentation bit:
Do not try to overwrite one Joomla! version family with a different one. Overwriting a major version with another (e.g. restoring a backup taken on Joomla! 3.7 on top of a site running Joomla! 2.5 or vice versa) or between different minor versions (e.g. restoring a backup taken on Joomla! 3.7 on top of a site running Joomla! 3.6 or vice versa) will NOT work. Joomla! moves files around between minor and major versions. Since the backup does not delete files not present in the backup archive this will end up with Joomla! being "confused" and malfunctioning. In these cases you should delete the existing files and folders (except, perhaps, user generated content) before restoring the backup. You can safely restore a sub-minor (path-level) version on top of another. For example, you can safely restore a Joomla! 3.7.5 site on top of a Joomla! 3.7.3 site or vice versa.
https://www.akeeba.com/documentation/akeeba-backup-joomla/restoring-backups.html#general-guidelines
While this was not always very important on Joomla 3.x versions (especially on Joomla 3.9 and 3.10), it is very important when the newer site is on Joomla 4.0 or later. There is a massive number of internal changes in Joomla between versions 3.x and 4.x, and there are a quite a few important ones even throughout the Joomla 4.x version family.
Nicholas K. Dionysopoulos
Lead Developer and Director
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