I've helped a few people out over at the Nokia Maemo forum who were seeing this error.. Each time it was found to be a problem with this file:

/home/user/.rtcom-eventlogger/el.db

Here's one example of a thread with the fix.. the downside is it means losing all your conversations/messages.. but I guess if you go into the conversations app its already blank? Maybe you can try and make sure it is blank before you follow this link

http://discussions.europe.nokia.com/...p/635122#M5784