OCP\Files\NotFoundException

Hi, trying to install nextcloud v11.0.1 on a router running optware, nginx and php5. After enabling debug, I get this error:

Type: OCP\Files\NotFoundException Code: 0 Message: File: /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/private/Files/Node/Node.php Line: 86 Trace #0 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/private/Files/Node/Node.php(223): OC\Files\Node\Node->getFileInfo() #1 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/private/Files/Node/Node.php(106): OC\Files\Node\Node->getPermissions() #2 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/private/Files/Node/Folder.php(144): OC\Files\Node\Node->checkPermissions(4) #3 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/private/legacy/util.php(370): OC\Files\Node\Folder->newFolder('Photos') #4 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/private/legacy/util.php(343): OC_Util::copyr('/tmp/mnt/sda1/o...', Object(OC\Files\Node\Folder)) #5 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/private/User/Session.php(414): OC_Util::copySkeleton('admin', Object(OC\Files\Node\Folder)) #6 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/private/User/Session.php(479): OC\User\Session->prepareUserLogin(true) #7 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/private/User/Session.php(299): OC\User\Session->loginWithPassword('admin', 'pass') #8 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/private/Setup.php(393): OC\User\Session->login('admin', 'pass') #9 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/core/Controller/SetupController.php(65): OC\Setup->install(Array) #10 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/lib/base.php(957): OC\Core\Controller\SetupController->run(Array) #11 /tmp/mnt/sda1/optware-ng.arm/share/nginx/html/owncloud/index.php(40): OC::handleRequest() #12 {main}

What version of php are you using, it should be php 5.6 or later. All required modules are installed?
https://docs.nextcloud.com/server/11/admin_manual/installation/source_installation.html#prerequisites