When I select a contact in my MS Outlook 2007 and click the "Mark for Sync" button on the "Salesforce Outlook Edition Main" toolbar, I get the following error message:

window title: Outlook Edition Error
Error message: "This record cannot be marked for sync because the association is invalid."

This error message only occurs on some of my contacts.  Once the error message comes up, that contact will not sync to Salesforce.com.

What "association" is invalid?  And how do I get the contact to sync?

I am using Salesforce Outlook Edition version 3.2.1.5 and MS Outlook 2007 (12.0.4518.1014).

Thanks