It is writeing a problem"Editor placeholder in source file" and i down't now what to do now

Im programmin a plong game import SpriteKit

import GameplayKit

class GameScene: SKScene {

    var ball = SKSpriteNode()

    var enemy = SKSpriteNode()

    var main = SKSpriteNode()

    override func didMove(to view: SKView) {

        ball = self.childNode(withName: "ball") as! SKSpriteNode

        enemy = self.childNode(withName: "enemy") as! SKSpriteNode

        main = self.childNode(withName: "main") as! SKSpriteNode

        

        ball.physicsBody?.applyImpulse(CGVector(dx: -20, dy: -20))

        

        let border = SKPhysicsBody (edgeLoopFrom: self.frame)

        border.friction = 0

        border.restitution = 1

        self.physicsBody = border

    }

    override func touchesBegan(_ touches: Set, with event: UIEvent?) {

    for touch in touches {

            let location = touch.location(in: self)

        

            main.run (SKAction.moveTo(x: location.x, duration: 0.2))

            

        }

    }

    override func touchesMoved(_ touches: Set, with event: UIEvent?) {

    for touch in touches {

            let location = touch.location(in: self)

        

            main.run (SKAction.moveTo(x: location.x, duration: 0.2))

            

        }

    }

    

    override func update(_ currentTime: TimeInterval) {

        enemy.run(SKAction.moveTo(x: ball.position.x, duration: 1.0))

    }

} and it comms a problem "Editor placeholder in source file" what i can do now??

It is writeing a problem"Editor placeholder in source file" and i down't now what to do now
 
 
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