Qml - ReferenceError: Screen is not defined - qml

Question

Trying to build a little fotball game as an project in school but I'm having some issues. So when I run the code it says that ReferenceError: Screen is not defined, but accordign to me I have defined it.
This code is just a prototype, going to change the keys to buttons later on so that it can actually work on a phone.
import QtQuick 2.0
Item {
id:root
width:Screen.width
height:Screen.height-10
focus:true
Keys.onPressed: {
if(event.key===Qt.Key_Up)
{
event.accepted = true;
player.y=(player.y) - 40
}
if(event.Key === Qt.Key_Down){
event.accepted = true;
player.y = (player.y)+ 40
}
if (event.key === Qt.Key_Right)
{ event.accepted=true;
player.x=(player.x)-40
}
if (event.key === Qt.Key_Left)
{event.accepted = true;
player.x=(player.x) +40
}
}
Flickable {
width:Screen.width
height:Screen.height
contentHeight: Screen.height*4
contentWidth:Screen.width
interactive:true
boundsBehavior: Flickable.StopAtBounds
Image{
id: feild
anchors.fill:parent
source:"Namnlös.png"
sourceSize.height:Screen.height*4
sourceSize.width:Screen.width
}
Image {
id: player
source:"asd.png"
x:Screen.width/2
y:Screen.height/2
}
}
}
So if you run this code you'll only get the player showing up, and then disapear instantly, the field is not shown.

Answer 1

You lack the Screen import.
import QtQuick.Window 2.1
Screen docs

Answer 2

Resizing items to screen is abnormal, you should simply use
resizeMode property
and anchor all child items inside root item.