맨처음에 프로젝트 만들고 실행한 ADV만들어서 실행하면 Hello World가 잘 나오는데요 design 창에서는 아무것도 안떠서 수정할 수 가 없네요....ㅠㅠ 삭제하고 재설치도 두번해봤고..(자바까지) 버튼을 새로추가해도 

This view is not constrained vertically: at runtime it will jump to the top unless you add a vertical constraint  The layout editor allows you to place widgets anywhere on the canvas, and it records the current position with designtime attributes (such as layout_editor_absoluteX). These attributes are not applied at runtime, so if you push your layout on a device, the widgets may appear in a different location than shown in the editor. To fix this, make sure a widget has both horizontal and vertical constraints by dragging from the edge connections.

이 오류가 같이뜨네요 

3시간동안 구글링중입니다..ㅠㅠ부탁드려요