I found an integrity error of the files .htaccess and .user.ini and looking in the documentation I found I had to upload a recent version of this files. So I went to the admin tool updater, to update owncloud to the latest version and in the initialization appears:
[GuzzleHttp\Exception\RequestException] e
e cURL error 60: SSL certificate problem: self signed certificate e
[GuzzleHttp\Ring\Exception\RingException] e
e cURL error 60: SSL certificate problem: self signed certificate e