Seamonkey 2.53.7

[carsten...@gmail.com]

With the latest Seamonkey release 2,53.7 and a new profile, Provider for Google Calendar 4.4.2 does not work properly any longer. The same issue on Ubuntu 20.04 and Windows 10. On an old system with a legacy profile (the old calendars) everything is still orking nicely. On the new systems, after the authentification process, the calendar window stays empty.

These are the error messages in the error console (with "de" environment, German):

Zeitstempel: 12.04.21, 21:29:00 MESZ
Fehler: InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable
Quelldatei: chrome://global/content/bindings/textbox.xml
Zeile: 233

Zeitstempel: 12.04.21, 21:29:09 MESZ
Fehler: DEPRECATION WARNING: onPromptStart has been replaced by onPromptStartAsync
You may find more details about this deprecation at: https://bugzilla.mozilla.org/show_bug.cgi?id=1176399
jar:file:///opt/seamonkey/omni.ja!/components/msgAsyncPrompter.js 27 _promiseAuthPrompt/<
jar:file:///opt/seamonkey/omni.ja!/components/msgAsyncPrompter.js 21 _promiseAuthPrompt
jar:file:///opt/seamonkey/omni.ja!/components/msgAsyncPrompter.js 44 run

Quelldatei: resource://gre/modules/Deprecated.jsm
Zeile: 77

Zeitstempel: 12.04.21, 21:29:30 MESZ
Fehler: NS_ERROR_NOT_AVAILABLE: Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIHttpChannel.responseStatus]
Quelldatei: resource://gdata-provider/modules/OAuth2.jsm
Zeile: 150

Zeitstempel: 12.04.21, 21:29:57 MESZ
Fehler: [Exception... "invalid_grant"  nsresult: "0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame :: resource://gdata-provider/modules/gdataSession.jsm :: login/authFailed< :: line 274"  data: no]

Any idea how to get it work?

Many thanks in advance.