This sounds like a known problem with Google authentication. Here is the
GNOME bug:
https://bugzilla.gnome.org/show_bug.cgi?id=771547
As a workaround, you can try restarting your computer.
** Changed in: gnome-calendar (Ubuntu)
Status: Incomplete => Triaged
** Bug watch added: GNOME Bug
Sorry to lack my bug report.
And may too difficut to understand my report because of not goot at English
GNOME Calender press key [Ctrl + N], displayed to create schedule. write
schedule with google calender(already entried google account to
[設定]→[オンラインアカウント]), and click [追加] in Japanese, and
Thank you for taking the time to report this bug and helping to make
Ubuntu better. Unfortunately, we cannot work on this bug because your
description didn't include enough information. You may find it helpful
to read "How to report bugs effectively"
