ERROR CoreMail.MessageListDataSource.CoreMail.AbstractDataSource.extend.fetchResponseSuccess

I have not been able to use iCloud mail on my Chrome/W7/Alienwate M18X (Update-to-date, 16GM of RAM,) for several days due to the error. It has previously been working.

Mail is one of the things I do not expect several day outages. Is there anything i can do on my end until Apple corrects this?