vertical layout error

i am trying to work out the examples given in the tutorial.i am working out the address book example in which the form and the data are splited using the split i am trying to get the form in the separate tab.want to used tabs for that application.i am getting an error
vertical layout already has a parent
.i am not able to understand where the problem is.can anyone tell me why that error is occurring.please help me out.


When you get errors like “ already has a parent” it means that the component (or layout) has already been added to a parent layout. One instance of a component cannot be added to multiple layouts/windows, you must use different instances.


ok.thank you.