Join the Mozilla’s Test Days event from Dec 2–8 to test the new Firefox address bar on Firefox Beta 134 and get a chance to win Mozilla swag vouchers! 🎁

Om de ûnderfining foar jo te ferbetterjen is tydlik de funksjonaliteit dan dizze website troch ûnderhâldswurk beheind. Wannear in artikel jo probleem net oplost en jo in fraach stelle wolle, kin ús stipemienskip jo helpe yn @FirefoxSupport op Twitter en /r/firefox op Reddit.

Sykje yn Support

Mij stipescams. Wy sille jo nea freegje in telefoannûmer te beljen, der in sms nei ta te stjoeren of persoanlike gegevens te dielen. Meld fertochte aktiviteit mei de opsje ‘Misbrûk melde’.

Mear ynfo

Dizze konversaasje is argivearre. Stel in nije fraach as jo help nedich hawwe.

An error occurred when writing to the calendar <calName> / MODIFICATION_FAILED

more options

When trying to delete a recurring event from a user-owned calendar (not Google, not network ical) I get the message "An error occurred when writing to the calendar Susan's Calendar / Error code: MODIFICATION_FAILED"

In the error console I get the following 2 lines:

There has been an error reading data for calendar: Susan's Calendar. However, this error is believed to be minor, so the program calCalendarManager.js:969:13 will attempt to continue. Error code: 0x80004005. Description: ID is null for deleteItem

An error occured when writing to the calendar Susan's Calendar! Error code: MODIFICATION_FAILED. Description: calCalendarManager.js:966

Why am I getting this error and how do I delete this event?

When trying to delete a recurring event from a user-owned calendar (not Google, not network ical) I get the message "An error occurred when writing to the calendar Susan's Calendar / Error code: MODIFICATION_FAILED" In the error console I get the following 2 lines: There has been an error reading data for calendar: Susan's Calendar. However, this error is believed to be minor, so the program calCalendarManager.js:969:13 will attempt to continue. Error code: 0x80004005. Description: ID is null for deleteItem An error occured when writing to the calendar Susan's Calendar! Error code: MODIFICATION_FAILED. Description: calCalendarManager.js:966 Why am I getting this error and how do I delete this event?

Alle antwurden (3)

more options

I've had this kind of error before, the only solution for me was to completely remove the calendar and reinstall it.

In my case I also had to export all events then delete the event from the exported file, then create the calendar again by importing the cleaned filed..

more options

That work and was pretty easy to do. Thanks!

more options

Thanks for letting me know! Don't forget to mark my post as the solution.