This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
What is the full exception stack trace?
BeanUtils is used to copy fields from one JavaBean to another. Most likely a bean has a field who's name matches a field in another bean but there's a type conflict. The stack trace should give you more information.