Hi Ken,
thank you for follow up.
url moodle.waldorf..... was the firstly updated version to 3.9 which did not work
The new url is moodle3.waldorf.... which is now a weekly built version 3.9.1+
(The different urls have been just for safety reasons to keep the database and moodle-data directoriy for the different versions)
With this version Moodle 3.9.1+ (Build: 20200807) I got it running again and the Activity Chooser is also working again!
So this is solved for me,
thank you all,
Ronnie
thank you for follow up.
url moodle.waldorf..... was the firstly updated version to 3.9 which did not work
The new url is moodle3.waldorf.... which is now a weekly built version 3.9.1+
(The different urls have been just for safety reasons to keep the database and moodle-data directoriy for the different versions)
With this version Moodle 3.9.1+ (Build: 20200807) I got it running again and the Activity Chooser is also working again!
So this is solved for me,
thank you all,
Ronnie
P.S.: for all with similar "invalid user" - error, which I mentioned above: The reason for this error message was the deleted "Guest User"!
Discussed here: https://tracker.moodle.org/browse/MDL-69076
Discussed here: https://tracker.moodle.org/browse/MDL-69076
(In my moodle database was for username=guest => deleted=1 which I had to correct to deleted=0)