Re: Strange and frequent error (An error occurred when writing to the calendar <cal name>!)

On 2015.06.15 19:59, Stefan Sitter wrote:
> On 15.06.2015 19:40, STF wrote:
>> Since I've reinstalled everything (Win7) in my home computer, I'm
>> getting a strange error from TB+Calendar from time to time.
>>
>> When that happens, I'd get a dialog on the screen saying
>>
>> An error occurred when writing to the calendar <cal name>!
>>
>> And there are two buttons: Details and OK
>>
>> The attached image shows what I get when I press "Details" (note that
>> my calendar name is "Me")
>>
>> I have no idea why I get this error from time to time. The problem
>> is that when I press "OK", most of the time, TB+Calendar would just
>> stop responding! And I have to kill the process from Task Manager and
>> rerun TB again.
>>
>> Anyone has seen this? What have I done wrong? I can't think of any.
>> Or maybe because I'm using WiFi -- but I had been using WiFi before
>> and I didn't get this problem.
>>
>> It's very weird!
>> Any idea?
>
> HTTP status code 403 means 'Forbidden', i.e. Lightning tries to perform
> an action that is not allowed by the server. The following might help to
> further investigate your problem:
>
> - the version of Thunderbird and Lightning you are using

They were TB 31.7 & Lightning 3.3.3 (I think).  Newer versions are out. 
  I'll update my TB & Lgt tonight to see if I still have the problem.

> - the type of calendar provider (ics, caldav, wcap, gdata, ...)

Gmail Caldav, with this URL
https://apidata.googleusercontent.com/caldav/v2/<some_email_addr>/events

I'm 100% sure the URL is correct as I've been using it for more than a year.

> - is the calendar cached or not

You mean if the option "Offline support" is checked?  No, it's not.

> - error messages from Error Console from the incident time

I haven't really checked it because when that dialog appears, and after 
I press OK, TB would stop responding.  To be more exact, when I click on 
TB main window, every click would produce a "ding" sound but the window 
does not react (except the sound).

> - what did you do when the popup occurred, e.g. syncing calendars,
> dismissing reminders, accepting invitations, ...

Sometimes it's after I've changed an event.  Sometimes I didn't do 
anything! Yeah, really nothing.  TB is running and idle for a long time, 
then suddenly the dialog would appear!

That's why I qualified the bug as "weird".