/root/.vnc/xstartup: line 27: xsetroot: command not found

At the time on vncserver startup Log file  /home/oracle/.vnc/myserver:3.log
shown below error

/root/.vnc/xstartup: line 27: xsetroot: command not found
/root/.vnc/xstartup: line 28: xterm: command not found
/root/.vnc/xstartup: line 29: twm: command not found

Solution
you need to install rpms related to xorg-x11-twm , xterm ,xsetroot

yum install xorg-x11-twm
yum install xterm
yum install xsetroot