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"Constraint Error: Google ID should be unique!" when Syncing with Google Calendar

Mark Lewis
on 7/31/15, 8:15 AM 1,732 views


I have this error syncing to Google Calendar

Constraint Error

Google ID should be unique!

Any idea how this can be fixed?


Beta Uliansyah
On 7/31/15, 8:40 PM

Try to upgrade Google Calendar Module from github. There is a code fix recently, solving sync problem.

This link explains more: 


Support solved it by deleting duplicate attendees and resetting the user token.

However its happening again.

I upgraded calendar and google calendar modules.

No joy

Mark Lewis
on 8/23/16, 10:52 AM
Mark Lewis
On 2/23/17, 1:04 PM


No I am on the online version.

Its because of duplicate attendees apparently but I can't find any duplicate attendees.

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Asked: 7/31/15, 8:15 AM
Seen: 1732 times
Last updated: 2/23/17, 1:04 PM