Javascript errors in HABPanel and CodeMirror

Below is part of the javascript console in Chrome looking at OH3 HABPanel. The symptoms are that Edit… in a Template doesn’t show the editor.

The install has a modest configuration. Trying the same thing on an identical install with an empty configuration works properly.

How can I start to track down what is causing these errors. Note there are more errors later in the log.

Kind regards,
Terry.

Registered widget type: button
widgets.module.js:38 Registered widget type: chart
widgets.module.js:38 Registered widget type: clock
widgets.module.js:38 Registered widget type: colorpicker
widgets.module.js:38 Registered widget type: dummy
widgets.module.js:38 Registered widget type: frame
widgets.module.js:38 Registered widget type: image
widgets.module.js:38 Registered widget type: knob
widgets.module.js:38 Registered widget type: label
widgets.module.js:38 Registered widget type: selection
widgets.module.js:38 Registered widget type: slider
widgets.module.js:38 Registered widget type: switch
widgets.module.js:38 Registered widget type: timeline
widgets.module.js:38 Registered widget type: template
vendor.js:36 [Violation] ‘DOMContentLoaded’ handler took 167ms
oh3storage.service.js:53 Panel configurations loaded
openhab.service.js:126 Setting locale to: en-GB
codemirror.js:5 Uncaught SyntaxError: Unexpected string
xml-fold.js:1 Uncaught ReferenceError: CodeMirror is not defined
at xml-fold.js:1
at xml-fold.js:1
(anonymous) @ xml-fold.js:1
(anonymous) @ xml-fold.js:1
matchbrackets.js:1 Uncaught ReferenceError: CodeMirror is not defined
at matchbrackets.js:1
at matchbrackets.js:1
(anonymous) @ matchbrackets.js:1
(anonymous) @ matchbrackets.js:1
matchtags.js:1 Uncaught ReferenceError: CodeMirror is not defined
at matchtags.js:1
at matchtags.js:1
(anonymous) @ matchtags.js:1
(anonymous) @ matchtags.js:1
closebrackets.js:1 Uncaught ReferenceError: CodeMirror is not defined
at closebrackets.js:1
at closebrackets.js:1
(anonymous) @ closebrackets.js:1
(anonymous) @ closebrackets.js:1
closetag.js:1 Uncaught ReferenceError: CodeMirror is not defined
at closetag.js:1
at closetag.js:1
(anonymous) @ closetag.js:1
(anonymous) @ closetag.js:1
overlay.js:1 Uncaught ReferenceError: CodeMirror is not defined
at overlay.js:1
at overlay.js:1
(anonymous) @ overlay.js:1
(anonymous) @ overlay.js:1
xml.js:1 Uncaught ReferenceError: CodeMirror is not defined
at xml.js:1
at xml.js:1
(anonymous) @ xml.js:1
(anonymous) @ xml.js:1
vendor.js:48 [Violation] ‘setTimeout’ handler took 64ms
openhab.service.js:38 Loaded 175 openHAB items
openhab.service.js:178 Updating HWS_Temperature state from 8.1 °C to 8.2 °C
openhab.service.js:178 Updating gTemperature state from 12.51 °C to 12.55 °C
openhab.service.js:178 Updating HWS_WindSpeed state from 6.0 km/h to 2.0 km/h
openhab.service.js:178 Updating HWS_WindChillTemperature state from 6.5 °C to 8.2 °C
openhab.service.js:178 Updating HWS_DewPointTemperature state from 7.0 °C to 7.1 °C
openhab.service.js:178 Updating HWS_WindDirection state from 0.0 ° to 225.0 °
openhab.service.js:178 Updating GF_Dining_Temperature state from 23.19 to 23.25
8[Violation] Added non-passive event listener to a scroll-blocking event. Consider marking event handler as ‘passive’ to make the page more responsive. See
vendor.js:119 ReferenceError: CodeMirror is not defined
at WidgetSettingsCtrlTemplate (template.widget.js:234)
at Object.invoke (vendor.js:42)
at R.instance (vendor.js:91)
at vendor.js:382
at vendor.js:132
at m.$eval (vendor.js:147)
at m.$digest (vendor.js:144)
at m.$apply (vendor.js:147)
at l (vendor.js:99)
at K (vendor.js:103)
(anonymous) @ vendor.js:119
(anonymous) @ vendor.js:92
(anonymous) @ vendor.js:133
$eval @ vendor.js:147
$digest @ vendor.js:144
$apply @ vendor.js:147
l @ vendor.js:99
K @ vendor.js:103
N.onload @ vendor.js:104
load (async)
(anonymous) @ vendor.js:104
n @ vendor.js:100
(anonymous) @ vendor.js:98
(anonymous) @ vendor.js:132
$eval @ vendor.js:147
$digest @ vendor.js:144
$apply @ vendor.js:147
(anonymous) @ vendor.js:281
eg @ vendor.js:37
d @ vendor.js:37
openhab.service.js:178 Updating OU_CarPort_Temperature state from 8.25 °C to 8.38 °C
openhab.service.js:178 Updating gTemperature state from 12.55 °C to 12.59 °C
openhab.service.js:178 Updating Current_DateTime state from 2021-01-18T22:33:20.431+0000 to 2021-01-18T22:34:20.432+0000

Please forgive the noise. Clearing the browser’s cache fixed everything.