TargetParameterCountException when IDataErrorInfo

[Alex]

Hi. I implement IDataErrorInfo in my ViewModel's class. I use RadDataForm that bind to simple source from viewmodel. When i start project i have exception (TargetParameterCountException Parametr count mismatch). What is wrong?

[Alex]

Also it is WPF project, but Silverlight project are working perfectly with the same viewmodel.