XML Parsing Error: undefined entity

[david0fc]

Using
Fedora 27
Thunderbird 52.7.0
Lightning 5.4.7
EWS 3.9.0

My calendar is in an Office365 cloud.

When I try to create a new event, either with Ctrl+I, or right-clicking on a calendar day and selecting "New Event...", I get a window with the following error:

XML Parsing Error: undefined entity
Location: chrome://lightning/content/lightning-item-iframe.xul
Line Number 115, Column 7:
      <button id="counter-proposal-btn"
------^

When running thnderbird from the command line, I also get:

JavaScript strict warning: chrome://exchangecalendar/content/exchService-common-sets.js, line 129: ReferenceError: reference to undefined property "itemClass"
JavaScript error: chrome://exchangecalendar/content/calendar-event-dialog.js, line 98: TypeError: this._document.getElementById(...) is null
1st-setup:2018-3-2 15:19:23.890:  -- It is an Exchange Calendar event:null
1st-setup:2018-3-2 15:19:23.892:  -- Could not add exchange attachment buttons:TypeError: this._document.getElementById(...) is null
1st-setup:2018-3-2 15:19:23.892:exchWebService.attachments.addAttachmentsFromItem: foutje:TypeError: documentLink is null
1st-setup:2018-3-2 15:19:23.892:exchWebService.attachments.addAttachmentsFromItem: title:null
1st-setup:2018-3-2 15:19:23.892:No attachments

ewslog.txt

I reckon this used to happen before with some other EWS version, but it was a long time ago.

Any clue? Any additional info needed?

[david0fc]

Seems that the old issue opened by me #562 did never resolved...

[david0fc]

The same happens with EWS 4.0.0-beta5

[leonadler]

#610