Setting up VNC for Ubuntu 16.04 LTS

Hi Experts,

My server is Ubuntu 16.04 LTS.
I am following the steps of  https://poweruphosting.com/blog/setup-vnc-server-on-ubuntu/ to set up the VNC server.
However, I fail in the last step like below. Can you please help me with this VNC configuration.

hsu@hcavfb11:~$ sudo systemctl status vncserver@1
● vncserver@1.service - Start TightVNC server at startup
   Loaded: loaded (/etc/systemd/system/vncserver@.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Fri 2017-11-24 10:31:34 JST; 18min ago

Nov 24 10:31:34 hcavfb11 systemd[1]: Starting Start TightVNC server at startup...
Nov 24 10:31:34 hcavfb11 systemd[1]: vncserver@1.service: Control process exited, code=exited status=217
Nov 24 10:31:34 hcavfb11 systemd[1]: Failed to start Start TightVNC server at startup.
Nov 24 10:31:34 hcavfb11 systemd[1]: vncserver@1.service: Unit entered failed state.
Nov 24 10:31:34 hcavfb11 systemd[1]: vncserver@1.service: Failed with result 'exit-code'.
hsu@hcavfb11:~$

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