Could not create path OCP \Files\ NotPermittedException

After the upgrade I face the following issue:

Entfernte Adresse: _removed_

    Anfragekennung: _removed_

    Typ: OCP\Files\NotPermittedException

    Code: 0

    Nachricht: Could not create path

    Datei: /var/www/vhosts/_removed_/httpdocs/lib/private/Files/Node/Folder.php

    Zeile: 194

Trace

#0 /var/www/vhosts/_removed_/httpdocs/lib/private/Files/SimpleFS/NewSimpleFile.php(133): OC\Files\Node\Folder->newFile()

#1 /var/www/vhosts/_removed_/httpdocs/lib/private/Template/IconsCacher.php(146): OC\Files\SimpleFS\NewSimpleFile->putContent()

#2 /var/www/vhosts/_removed_/httpdocs/lib/private/Template/SCSSCacher.php(353): OC\Template\IconsCacher->setIconsCss()

#3 /var/www/vhosts/_removed_/httpdocs/lib/private/Template/SCSSCacher.php(190): OC\Template\SCSSCacher->cache()

#4 /var/www/vhosts/_removed_/httpdocs/lib/private/Template/CSSResourceLocator.php(111): OC\Template\SCSSCacher->process()

#5 /var/www/vhosts/_removed_/httpdocs/lib/private/Template/CSSResourceLocator.php(63): OC\Template\CSSResourceLocator->cacheAndAppendScssIfExist()

#6 /var/www/vhosts/_removed_/httpdocs/lib/private/Template/ResourceLocator.php(79): OC\Template\CSSResourceLocator->doFind()

#7 /var/www/vhosts/_removed_/httpdocs/lib/private/TemplateLayout.php(329): OC\Template\ResourceLocator->find()

#8 /var/www/vhosts/_removed_/httpdocs/lib/private/TemplateLayout.php(237): OC\TemplateLayout::findStylesheetFiles()

#9 /var/www/vhosts/_removed_/httpdocs/lib/private/legacy/OC_Template.php(183): OC\TemplateLayout->__construct()

#10 /var/www/vhosts/_removed_/httpdocs/lib/public/AppFramework/Http/TemplateResponse.php(210): OC_Template->fetchPage()

#11 /var/www/vhosts/_removed_/httpdocs/lib/private/AppFramework/Http/Dispatcher.php(123): OCP\AppFramework\Http\TemplateResponse->render()

#12 /var/www/vhosts/_removed_/httpdocs/lib/private/AppFramework/App.php(152): OC\AppFramework\Http\Dispatcher->dispatch()

#13 /var/www/vhosts/_removed_/httpdocs/lib/private/Route/Router.php(309): OC\AppFramework\App::main()

#14 /var/www/vhosts/_removed_/httpdocs/lib/base.php(1008): OC\Route\Router->match()

#15 /var/www/vhosts/_removed_/httpdocs/index.php(37): OC::handleRequest()

#16 {main}

I can not access anymore to UI after I’m logged in.

Could be a permission problem, depends how you upgraded (if you did it manually and the folder belong to root for example).