[horde] Error when syncing with activesync

[Roman Gelfand]

When adding contact on the phone, I am getting the following messages...

2015-02-01T20:23:33+00:00 INFO: [24071]
Horde_Core_ActiveSync_Driver::changeMessage(@Contacts@,  ...)
2015-02-01T20:23:33+00:00 ERR: Invalid address book: kl8HRYCsNtL9WEhN3MX1qA5
2015-02-01T20:23:33+00:00 ERR: [24071] Change message failed when updating


What and where do I need to change in my configuraiton?

Thanks in advance