VNC server not working

Hello all,
I am using One Plus One marshmallow and was try to setup a vnc server but whenever i start the server it gives me error and quit if someone can help that will be great.. thanks once again...

root@kali:/# vncserver :1 -geometry 1920x1080 && echo "Closing terminal in 5 secs" && sleep 5 && exit
New 'localhost:1 (root)' desktop at :1 on machine localhost

Starting applications specified in /etc/X11/Xvnc-session
Log file is /root/.vnc/localhost:1.log

Use xtigervncviewer -SecurityTypes VncAuth -passwd /root/.vnc/passwd :1 to connect to the VNC server.


vncserver: Failed command '/etc/X11/Xvnc-session': 256!

=================== tail -15 /root/.vnc/localhost:1.log ===================
Killing Xtigervnc process ID 2624... which seems to be deadlocked. Using SIGKILL!

Xvnc TigerVNC 1.7.0 - built Feb 9 2017 22:51:56
Copyright (C) 1999-2016 TigerVNC Team and many others (see README.txt)
See http://www.tigervnc.org for information on TigerVNC.
Underlying X server release 11901000, The X.Org Foundation


Fri Mar 17 08:34:30 2017
vncext: VNC extension running!
vncext: Listening for VNC connections on local interface(s), port 5901
vncext: created VNC server for screen 0
/etc/X11/Xvnc-session: 7: /etc/X11/Xvnc-session: /su/bin/sush: not found
vncconfig: unable to open display ":1"
Killing Xtigervnc process ID 4279... which seems to be deadlocked. Using SIGKILL!

================================================== =========================

Starting applications specified in /etc/X11/Xvnc-session has failed.
Maybe try something simple first, e.g.,
tigervncserver -xstartup /usr/bin/xterm
root@kali:/#