Comment 23 for bug 1044549

The accounts.conf file is also used by the new Ubuntu online accounts configuration. The problem seems to be that after an upgrade the old entry from the original Gnome online accounts application is left. The new online accounts utility adds entries after the previous one which is the one causing the problem.

This is the old entry in my case:

[Account account_1388648527]
Provider=google
<email address hidden>
<email address hidden>
MailEnabled=true
CalendarEnabled=true
ContactsEnabled=true
ChatEnabled=true
DocumentsEnabled=true

Just editing the accounts.conf file and removing just this entry solved the problem. If you remove the file you will have to rerun the new online accounts application in order to recreate your new configuration.