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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
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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, 12.0.2): 15.0.0.10
Operating system and version (eg, Ubuntu 17.04): OpenMediaVault 4.1.16-2 (based on Debian)
Apache or nginx version (eg, Apache 2.4.25): nginx 1.10.3
PHP version (eg, 7.1): 7.0.33
The issue you are facing: Internal Error (OCP\Files\NotFoundException)
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- I type the ip to access the web interface,
- I connect myself,
- I have the error message (output of my Nextcloud) below.
The output of your Nextcloud log in Admin > Logging:
- /!\ The output is in FRENCH
Erreur interne du serveur
Le serveur est incapable d'exécuter votre requête.
Si cela se reproduit, veuillez envoyer les détails techniques ci-dessous à l'administrateur du serveur.
Le fichier journal du serveur peut fournir plus de renseignements.
Renseignements techniques
Adresse distante : 162.158.92.110
ID de la demande : WKfw5WJ6Mp7Cvlqocfgo
Type : OCP\Files\NotFoundException
Code : 0
Message :
Fichier : /config/www/nextcloud/lib/private/Files/Node/Node.php
Ligne : 97
Trace
#0 /config/www/nextcloud/lib/private/Files/Node/Node.php(216): OC\Files\Node\Node->getFileInfo()
#1 /config/www/nextcloud/lib/private/Files/Node/Node.php(117): OC\Files\Node\Node->getPermissions()
#2 /config/www/nextcloud/lib/private/Files/Node/Folder.php(155): OC\Files\Node\Node->checkPermissions(4)
#3 /config/www/nextcloud/lib/private/Files/AppData/AppData.php(94): OC\Files\Node\Folder->newFolder('avatar')
#4 /config/www/nextcloud/lib/private/Files/AppData/AppData.php(114): OC\Files\AppData\AppData->getAppDataFolder()
#5 /config/www/nextcloud/lib/private/AvatarManager.php(102): OC\Files\AppData\AppData->newFolder('Valentin')
#6 /config/www/nextcloud/lib/private/TemplateLayout.php(105): OC\AvatarManager->getAvatar('Valentin')
#7 /config/www/nextcloud/lib/private/legacy/template.php(211): OC\TemplateLayout->__construct('user', 'files')
#8 /config/www/nextcloud/lib/public/AppFramework/Http/TemplateResponse.php(157): OC_Template->fetchPage(Array)
#9 /config/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php(119): OCP\AppFramework\Http\TemplateResponse->render()
#10 /config/www/nextcloud/lib/private/AppFramework/App.php(118): OC\AppFramework\Http\Dispatcher->dispatch(Object(OCA\Files\Controller\ViewController), 'index')
#11 /config/www/nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php(47): OC\AppFramework\App::main('ViewController', 'index', Object(OC\AppFramework\DependencyInjection\DIContainer), Array)
#12 [internal function]: OC\AppFramework\Routing\RouteActionHandler->__invoke(Array)
#13 /config/www/nextcloud/lib/private/Route/Router.php(297): call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array)
#14 /config/www/nextcloud/lib/base.php(987): OC\Route\Router->match('/apps/files/')
#15 /config/www/nextcloud/index.php(42): OC::handleRequest()
#16 {main}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'memcache.local' => '\\OC\\Memcache\\APCu',
'datadirectory' => '/data',
'instanceid' => 'xxxxxxxxxxxx',
'passwordsalt' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
'secret' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
'trusted_domains' =>
array (
0 => 'xxx.xxx.x.xx:xxxx',
1 => 'xx.xxx.xxx.xxx:xxxx',
),
'dbtype' => 'mysql',
'version' => '15.0.0.10',
'overwrite.cli.url' => 'https://xxx.xxx.x.xx:xxxx',
'dbname' => 'nextcloud',
'dbhost' => 'xx.xxx.xxx.xxx:xxxx',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'xxxxxx',
'dbpassword' => 'xxxxxxxxxx',
'installed' => true,
'debug'=> true,
);
The output of your Apache/nginx/system log in /var/log/____:
- Download link : error.log