Oc_readonly not registered with guest app, oC10.0.3

Server
1

Hi,

I am running oC 10.0.3 with the current guest app.
I am using LDAP app for the normal users.
I was not using guests before, but now was starting to do so. But I am experiencing a problem.
The username of the guest is name@his-domain.com.

Inviting the guest works fine. He gets his email.

But when he tries to login, I get the following in the owncloud.log:

{"reqId":"832SUWNaZMDy6a1cB5aX","level":2,"time":"2017-11-19T11:35:54+00:00","remoteAddr":"87.138.204.124","user":"name@his-domain.com","app":"filesystem","method":"POST","url":"\/owncloud\/login?redirect_url=%252Fowncloud%252Ff%252F17753","message":"Storage wrapper 'oc_readonly' was not registered via the 'OC_Filesystem - preSetup' hook which could cause potential problems."}
{"reqId":"gUkKNLh3rY9H8x7ZM1xH","level":2,"time":"2017-11-19T11:35:54+00:00","remoteAddr":"87.138.204.124","user":"name@his-domai.com","app":"filesystem","method":"GET","url":"\/owncloud\/f\/17753","message":"Storage wrapper 'oc_readonly' was not registered via the 'OC_Filesystem - preSetup' hook which could cause potential problems."}
{"reqId":"gUkKNLh3rY9H8x7ZM1xH","level":3,"time":"2017-11-19T11:35:54+00:00","remoteAddr":"87.138.204.124","user":"name@his-domain.com","app":"index","method":"GET","url":"\/owncloud\/f\/17753","message":"Exception: {\"Exception\":\"OCP\\\\Files\\\\NotFoundException\",\"Message\":\"\\\/name@his-domain.com\\\/files\",\"Code\":0,\"Trace\":\"#0 \\\/srv\\\/www\\\/owncloud\\\/apps\\\/files\\\/lib\\\/Controller\\\/ViewController.php(279): OC\\\\Files\\\\Node\\\\Root->get('\\\/name@hisdomain...')\\n#1 [internal function]: OCA\\\\Files\\\\Controller\\\\ViewController->showFile('17753')\\n#2 \\\/srv\\\/www\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Http\\\/Dispatcher.php(159): call_user_func_array(Array, Array)\\n#3 \\\/srv\\\/www\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Http\\\/Dispatcher.php(89): OC\\\\AppFramework\\\\Http\\\\Dispatcher->executeController(Object(OCA\\\\Files\\\\Controller\\\\ViewController), 'showFile')\\n#4 \\\/srv\\\/www\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/App.php(98): OC\\\\AppFramework\\\\Http\\\\Dispatcher->dispatch(Object(OCA\\\\Files\\\\Controller\\\\ViewController), 'showFile')\\n#5 \\\/srv\\\/www\\\/owncloud\\\/lib\\\/public\\\/AppFramework\\\/App.php(135): OC\\\\AppFramework\\\\App::main('ViewController', 'showFile', Object(OC\\\\AppFramework\\\\DependencyInjection\\\\DIContainer))\\n#6 \\\/srv\\\/www\\\/owncloud\\\/core\\\/routes.php(88): OCP\\\\AppFramework\\\\App->dispatch('ViewController', 'showFile')\\n#7 [internal function]: OC\\\\Route\\\\Router->{closure}(Array)\\n#8 \\\/srv\\\/www\\\/owncloud\\\/lib\\\/private\\\/Route\\\/Router.php(307): call_user_func(Object(Closure), Array)\\n#9 \\\/srv\\\/www\\\/owncloud\\\/lib\\\/base.php(928): OC\\\\Route\\\\Router->match('\\\/f\\\/17753')\\n#10 \\\/srv\\\/www\\\/owncloud\\\/index.php(56): OC::handleRequest()\\n#11 {main}\",\"File\":\"\\\/srv\\\/www\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Node\\\/Root.php\",\"Line\":186}"}
{"reqId":"2qqsetYuWMxFy3JhK1WB","level":2,"time":"2017-11-19T11:35:54+00:00","remoteAddr":"87.138.204.124","user":"name@his-domain.com","app":"filesystem","method":"GET","url":"\/owncloud\/f\/index.php\/apps\/guests\/whitelist","message":"Storage wrapper 'oc_readonly' was not registered via the 'OC_Filesystem - preSetup' hook which could cause potential problems."}

I see oc_readonly was not registered.

Is there a misconfiguration on my side or is this a bug? After some googling and finding such issues, I am not sure about this.

Thanks a lot
Cornelius