xterm does not start.
xterm may be installed in a different path.
Please try switching path to xterm (Linux: Type 1) and xterm (Linux: Type 2) by clicking arrow button next to Execution Command in Xstart.
- Type 1 : /usr/X11R6/bin/xterm -ls -display $DISPLAY
- Type 2 : /usr/bin/xterm -ls -display $DISPLAY