Loggin screen produces wicket errors

17.06.2008 17:36:19 WARN [org.apache.wicket.markup.html.form.AbstractTextComponent.getModelType():148] Couldn't resolve model type of Model:classname=[org.apache.wicket.model.PropertyModel]:nestedModel=[]:expression=[username] for [MarkupContainer [Component id = username, page = org.hippoecm.frontend.Home, path = 15:root:signInForm:username.RequiredTextField, isVisible = true, isVersioned = false]], please set the type yourself.
17.06.2008 17:36:19 WARN [org.apache.wicket.markup.html.form.AbstractTextComponent.getModelType():148] Couldn't resolve model type of Model:classname=[org.apache.wicket.model.PropertyModel]:nestedModel=[]:expression=[password] for [MarkupContainer [Component id = password, page = org.hippoecm.frontend.Home, path = 15:root:signInForm:password.PasswordTextField, isVisible = true, isVersioned = false]], please set the type yourself.