Customizing MATLAB form.yml and submit.yml.erb, simplifying default; different versions referenced

Well I typed ‘quit’ in MATLAB and every subsequent attempt fails with:

[websockify]: started successfully (proxying 17266 ==> localhost:5901)
Scanning VNC log file for user authentications...
Generating connection YAML file...
+ xsetroot -solid '#D3D3D3'
+ xfce4-panel --sm-client-disable
+ xfsettingsd --sm-client-disable

(xfce4-panel:595241): xfce4-panel-WARNING **: 15:55:43.945: Failed to connect to the D-BUS session bus: Could not connect: Connection refused

(xfce4-panel:595241): xfce4-panel-CRITICAL **: 15:55:43.946: Name org.xfce.Panel lost on the message dbus, exiting.
xfsettingsd: Could not connect: Connection refused.

(xfsettingsd:595240): xfsettingsd-ERROR **: 15:55:43.946: Failed to connect to the dbus session bus.
xfce4-panel: There is already a running instance

Terminated
Cleaning up...
Killing Xvnc process ID 594907

Based on some other threads I removed --daemon from xfwm4 --compositor=off --daemon --sm-client-disable and set:
xfsettingsd --sm-client-disable&
in template/script.sh.erb

Where’d I go astray?