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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 25.0.13
Operating system and version (eg, Ubuntu 20.04): Debian 11
Apache or nginx version (eg, Apache 2.4.25): Apache
PHP version (eg, 7.4): 7.4
The issue you are facing:
I have an instance of Nextcloud 25.1 on a machine that I must replace. I’ve installed a 25.1.3 version on a new machine. On this new installation, I’ve set up a data folder and this is working. Then I added an extra HD to store data and copied all the main server files to it. When I change “datadirectory” on the config file to this new data folder, Nextcloud crashes and I cannot login anymore.
When this happens, I disable the app groupfolders with occ and then I manage to login again.
I can use this new data folder if the app groupfolders is disabled, all the files are there and I can see and use them.
The groupfolder from the new installation works fine, only the groupfolder on the new disk doesn’t.
I’m getting mad here and I couldn’t find a solution on this forum or on Google and I even talked to some folks that also use Nextcloud but to no avail.
If anybody could help in anyway I would be very greatful.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Installed a new server with the same version of the old server
- Restored the database (MySQL)
- Pointed the datafolder to a new directory with the original files from the old server
The output of your Nextcloud log in Admin > Logging:
[index] Erro: Exception: Typed property OCA\GroupFolders\Helper\LazyFolder::$folder must be an instance of OCP\Files\Folder or null, OC\Files\Node\File used in file '/var/www/html/nextcloud25/apps/groupfolders/lib/Helper/LazyFolder.php' line 43 at <<closure>>
0. /var/www/html/nextcloud25/lib/private/AppFramework/App.php line 172
OC\AppFramework\Http\Dispatcher->dispatch()
1. /var/www/html/nextcloud25/lib/private/Route/Router.php line 298
OC\AppFramework\App::main()
2. /var/www/html/nextcloud25/lib/base.php line 1053
OC\Route\Router->match()
3. /var/www/html/nextcloud25/index.php line 36
OC::handleRequest()
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
$CONFIG = array (
'instanceid' => 'XXXXXXXXXXX',
'passwordsalt' => 'XXXXXXXXXXX',
'secret' => 'XXXXXXXXXXX',
'trusted_domains' =>
array (
0 => 'XXXXXXXXXXX',
),
// 'datadirectory' => '/var/www/nextcloud-data-25',
'datadirectory' => '/mnt/nextcloud/data',
'dbtype' => 'mysql',
'version' => '25.0.13.2',
'overwrite.cli.url' => 'XXXXXXXXXXXX',
'dbname' => 'XXXXXXXXXXXX',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'XXXXXXXXXXXX',
'dbpassword' => 'XXXXXXXXXXXX',
'installed' => true,
'maintenance' => false,
'defaultapp' => 'dashboard',
'maintenance' => false,
'theme' => '',
'loglevel' => 3,
'log_type' => 'file',
'logfile' => '/mnt/nextcloud/data/nextcloud.log',
);
The output of your Apache/nginx/system log in /var/log/____:
No error on Apache logs
