From: DeskNow Knowledge Base
http://www.desknow.com/kb/

Incorrect string value: ....
http://www.desknow.com/kb/idx/11/198/article/

This error typically occurs when you use MySQL as your database, and you did not configure MySQL to use Unicode encoding in its tables.

See http://www.desknow.com/kb/idx/0/175/article/