xcode - IOS Swift: EXC_BAD_INSTRUCTION -

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import spritekit  let ballcategoryname = "ball" let paddlecategoryname = "paddle" let blockcategoryname = "block" let blocknodecategoryname = "blocknode"  class gamescene: skscene {     override func didmovetoview(view: skview) {         super.didmovetoview(view)          // 1. create physics body borders screen         let borderbody = skphysicsbody(edgeloopfromrect: self.frame)          // 2. set friction of physicsbody 0         borderbody.friction = 0          // 3. set physicsbody of scene borderbody         self.physicsbody = borderbody           physicsworld.gravity = cgvectormake(0, 0)         let ball = childnodewithname(ballcategoryname) as! skspritenode         ball.physicsbody!.applyimpulse(cgvectormake(10, -10))           } }

on line of code:

let ball = childnodewithname(ballcategoryname) skspritenode

i error:

"thread 1:exc_bad_instruction (code=exc_1386_invop, subcode=0x0)

why?

running xcode version 6.4 (6e35b)

try init ball : 

let ball : skspritenode = childnodewithname(ballcategoryname) skspritenode

let me know if find issue.

thanks


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