Terminating app due to uncaught exception while running app - ios

Question

I am making a game in which if I press a button the player (circuloPrincipal) changes to the color to a color determinate by the button.
When I run my game sometimes crashes with the error below. I havent find the error, because I cont know how to interpretate
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attemped to add a SKNode which already has a parent: name:'button4' texture:[ 'circuloBoton' (100 x 100)] position:{407, 39} scale:{1.00, 1.00} size:{60, 60} anchor:{0.5, 0.5} rotation:0.00'
circuloPrincipal.size = CGSize(width: 225, height: 225)
circuloPrincipal.position = CGPoint(x: frame.width / 2, y: frame.height / 2)
circuloPrincipal.color = colorAzul
circuloPrincipal.colorBlendFactor = 1.0
circuloPrincipal.physicsBody = SKPhysicsBody(circleOfRadius: circuloPrincipal.size.height / 2)
circuloPrincipal.physicsBody?.contactTestBitMask = physicsCategory.circuloPrincipal
circuloPrincipal.physicsBody?.collisionBitMask = physicsCategory.enemigo
circuloPrincipal.physicsBody?.contactTestBitMask = physicsCategory.enemigo
circuloPrincipal.physicsBody?.affectedByGravity = false
circuloPrincipal.physicsBody?.dynamic = false
circuloPrincipal.name = "circuloPrincipal"
circuloPrincipal.zPosition = 5.0
circuloBlanco.size = CGSize(width: 60, height: 60)
circuloBlanco.position = CGPoint(x: frame.width / 2 - 105 , y: frame.height / 2 - 345)
circuloBlanco.color = colorBlanco
circuloBlanco.colorBlendFactor = 1.0
circuloBlanco.zPosition = 4.0
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Called when a touch begins */
if gameStarted == false {
circuloVerde.removeFromParent()
circuloMorado.removeFromParent()
circuloRojo.removeFromParent()
circuloBlanco.removeFromParent()
circuloPrincipal.color = colorAzul
enemigoTimer = NSTimer.scheduledTimerWithTimeInterval(0.7, target: self, selector: Selector("enemigos"), userInfo: nil, repeats: true)
gameStarted = true
circuloPrincipal.runAction(SKAction.scaleTo(0.44, duration: 0.4))
score = 0
scoreLabel.text = "\(score)"
hits = 0
highscoreLabel.runAction(SKAction.fadeOutWithDuration(0.5))
}
circuloVerde.name = "button"
let touch = touches.first
let positionInScene = touch!.locationInNode(self)
let touchedNode = self.nodeAtPoint(positionInScene)
if let name = touchedNode.name {
if name == "button" {
circuloPrincipal.color = colorVerde
}
}
circuloAmarillo.name = "button2"
let touch2 = touches.first
let positionInScene2 = touch2!.locationInNode(self)
let touchedNode2 = self.nodeAtPoint(positionInScene2)
if let name = touchedNode2.name {
if name == "button2" {
circuloPrincipal.color = colorAmarillo
}
}
circuloAzul.name = "button3"
let touch3 = touches.first
let positionInScene3 = touch3!.locationInNode(self)
let touchedNode3 = self.nodeAtPoint(positionInScene3)
if let name = touchedNode3.name {
if name == "button3" {
//do my stuff
circuloPrincipal.color = colorAzul
}
}
circuloBlanco.name = "button4"
let touch4 = touches.first
let positionInScene4 = touch4!.locationInNode(self)
let touchedNode4 = self.nodeAtPoint(positionInScene4)
if let name = touchedNode4.name {
if name == "button4" {
circuloPrincipal.color = colorBlanco
}
}
circuloRojo.name = "button5"
let touch5 = touches.first
let positionInScene5 = touch5!.locationInNode(self)
let touchedNode5 = self.nodeAtPoint(positionInScene5)
if let name = touchedNode5.name {
if name == "button5" {
circuloPrincipal.color = colorRojo
}
}
circuloMorado.name = "button6"
let touch6 = touches.first
let positionInScene6 = touch6!.locationInNode(self)
let touchedNode6 = self.nodeAtPoint(positionInScene6)
if let name = touchedNode6.name {
if name == "button6" {
circuloPrincipal.color = colorMorado
}
}
}

Answer 1

you're trying to add a node but it already has a parent. its right there in the error message.
you can check to see if it already has a parent like this
let childNode = SKNode()
let parentNode = SKNode()
if childNode.parent == nil {
parentNode.addChild(childNode)
}