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The error indicates that Joomla's PSR-4 autoloader cache has a stale entry pointing to a class that either doesn't exist at the expected path or belongs to a different version of the YOOtheme plugin.

There are two likely causes depending on how you performed the restoration:

Did you delete the old site's files before extracting the backup archive?

• If you did not delete the old files first, you likely have a mix of files from two different versions of the YOOtheme plugin on disk. In this case, you need to perform a clean restoration: delete all files from the site's root directory, then extract the backup archive again using Kickstart.

• If you did delete the old files first, the problem is a stale autoloader cache. Connect to your site via FTP/SFTP and delete the file administrator/cache/autoload_psr4.php. Joomla will regenerate it automatically on the next request, picking up the correct class paths.

After completing either step, try accessing the site again.