Does anyone know what conditions will cause this error message? I've had a few users report this issue and I've not managed to replicate the problem. I would greatly appreciate any tips on the conditions that cause this error to occur. When my product updates Gmail contacts it does set a _single/0 email address as primary. So I know that the update/insert only contains only one primary email address. Does this happen if there are duplicate contacts in Gmail with the same primary email address? thanks for any help.
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