parse_vt_settings: Cannot open /dev/tty0 (Permission denied)

[tcz001]

Hi, I'm testing the oz on a debian virtual machine running on parallels
the debian version as:
Linux debian-gnu-linux-vm 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u3 (2017-08-06) x86_64 GNU/Linux
After installing all the packages needed for oz, I was able to run the oz-daemon, but when I start an application for example libreoffice here, the xpra-server shows an error about /dev/tty0

How can I get rid of this error?

2018/05/16
 16:06:12 [libreoffice] -------------------------------------------------------------------
2018/05/16 16:06:12 [libreoffice] Hostname set to (libreoffice.local)
2018/05/16 16:06:12 [libreoffice] dbus-uuid: 690e6d89eece41d062bf8e645afbe674
2018/05/16 16:06:12 [libreoffice] xpra work dir is /home/parallels/.Xoz/libreoffice
2018/05/16 16:06:12 [libreoffice] Starting xpra server
2018/05/16 16:06:12 [libreoffice] (xpra-server) I /usr/bin/xpra [/usr/bin/xpra --no-daemon --mmap --no-sharing --bell --system-tray --xsettings --cursors --encoding=rgb --clipboard --no-microphone --no-speaker --no-notifications --no-mdns --input-method=keep --bind=/home/parallels/.Xoz/libreoffice --socket-dir=/home/parallels/.Xoz/libreoffice start :0]
2018/05/16 16:06:12 [libreoffice] (xpra-server) Warning: invalid option: 'html'
2018/05/16 16:06:12 [libreoffice] (xpra-server) WARNING: low display number: 0
2018/05/16 16:06:12 [libreoffice] (xpra-server) You are attempting to run the xpra server against what seems to be a default X11 display ':0'.
2018/05/16 16:06:12 [libreoffice] (xpra-server) This is generally not what you want.
2018/05/16 16:06:12 [libreoffice] (xpra-server) You should probably use a higher display number just to avoid any confusion (and also this warning message).
2018/05/16 16:06:12 [libreoffice] (xpra-server) _XSERVTransmkdir: ERROR: euid != 0,directory /tmp/.X11-unix will not be created.
2018/05/16 16:06:12 [libreoffice] (xpra-server) X.Org X Server 1.19.2
2018/05/16 16:06:12 [libreoffice] (xpra-server) Release Date: 2017-03-02
2018/05/16 16:06:12 [libreoffice] (xpra-server) X Protocol Version 11, Revision 0
2018/05/16 16:06:12 [libreoffice] (xpra-server) Build Operating System: Linux 4.9.0-3-amd64 x86_64 Debian
2018/05/16 16:06:12 [libreoffice] (xpra-server) Current Operating System: Linux libreoffice 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u3 (2017-08-06) x86_64
2018/05/16 16:06:12 [libreoffice] (xpra-server) Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.9.0-3-amd64 root=UUID=769728ac-2c37-435f-a688-152ebe3018b3 ro quiet
2018/05/16 16:06:12 [libreoffice] (xpra-server) Build Date: 07 July 2017  06:14:06AM
2018/05/16 16:06:12 [libreoffice] (xpra-server) xorg-server 2:1.19.2-1+deb9u1 (https://www.debian.org/support) 
2018/05/16 16:06:12 [libreoffice] (xpra-server) Current version of pixman: 0.34.0
2018/05/16 16:06:12 [libreoffice] (xpra-server) 	Before reporting problems, check http://wiki.x.org
2018/05/16 16:06:12 [libreoffice] (xpra-server) 	to make sure that you have the latest version.
2018/05/16 16:06:12 [libreoffice] (xpra-server) Markers: (--) probed, (**) from config file, (==) default setting,
2018/05/16 16:06:12 [libreoffice] (xpra-server) 	(++) from command line, (!!) notice, (II) informational,
2018/05/16 16:06:12 [libreoffice] (xpra-server) 	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
2018/05/16 16:06:12 [libreoffice] (xpra-server) (++) Log file: "/home/parallels/.xpra/Xorg.:0.log", Time: Wed May 16 16:06:12 2018
2018/05/16 16:06:12 [libreoffice] (xpra-server) (++) Using config file: "/etc/xpra/xorg.conf"
2018/05/16 16:06:12 [libreoffice] (xpra-server) (==) Using system config directory "/usr/share/X11/xorg.conf.d"
2018/05/16 16:06:12 [libreoffice] (xpra-server) (EE) 
2018/05/16 16:06:12 [libreoffice] (xpra-server) Fatal server error:
2018/05/16 16:06:12 [libreoffice] (xpra-server) (EE) parse_vt_settings: Cannot open /dev/tty0 (Permission denied)
2018/05/16 16:06:12 [libreoffice] (xpra-server) (EE) 
2018/05/16 16:06:12 [libreoffice] (xpra-server) (EE) 
2018/05/16 16:06:12 [libreoffice] (xpra-server) Please consult the The X.Org Foundation support 
2018/05/16 16:06:12 [libreoffice] (xpra-server) 	 at http://wiki.x.org
2018/05/16 16:06:12 [libreoffice] (xpra-server)  for help. 
2018/05/16 16:06:12 [libreoffice] (xpra-server) (EE) Please also check the log file at "/home/parallels/.xpra/Xorg.:0.log" for additional information.
2018/05/16 16:06:12 [libreoffice] (xpra-server) (EE) 
2018/05/16 16:06:12 [libreoffice] (xpra-server) (EE) Server terminated with error (1). Closing log file.
2018/05/16 16:06:15 [libreoffice] (xpra-server) could not connect to X server on display ':0' after 3 seconds
2018/05/16 16:06:15 [libreoffice] Child process pid=10 exited from init with status 1