xcode swift ボタンの追加について　エラーが発生

前提・実現したいこと

Spritekit GameScene で作ったプログラムに　Storyboardから作成した
UIButtonを追加したいと思います。
クラスを合わせることによって、接続はできているようですが、
エラーが発生してしまいます。

どこが問題なのか、ご教示のほどお願いいたします。

発生している問題・エラーメッセージ

2018-06-09 18:35:03.301596+0900 saishokara[27381:595809] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<saishokara.GameScene 0x7ff35d508ab0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key storyboard.'
*** First throw call stack:
(

省略

libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

該当のソースコード

swift
1import SpriteKit
2import GameplayKit
3import Foundation
4import UIKit
5
6class GameScene: SKScene {
7    
8    var circle = SKShapeNode(circleOfRadius: 100)
9    var location = CGPoint(x:0,y:0)
10    var animator: UIDynamicAnimator?
11    var i = 0
12    var myLabel = SKLabelNode(fontNamed:"Chalkduster")
13    var currentMoney = 0
14    var cumulativeNumberOfTouches = 0
15    
16    override func didMove(to view: SKView) {
17        
18        self.physicsBody = SKPhysicsBody(edgeLoopFrom: self.frame)
19//        self.backgroundColor = UIColor.black
20        // ボタンを生成.
21        let myButton = UIButton()
22        myButton.frame = CGRect(x:0,y:0,width:200,height:40)
23        myButton.backgroundColor = UIColor.red
24        myButton.layer.masksToBounds = true
25        myButton.setTitle("Add Block", for: [])
26        myButton.setTitleColor(UIColor.white, for: [])
27        myButton.setTitle("Done", for: UIControlState.highlighted)
28        myButton.setTitleColor(UIColor.black, for: UIControlState.highlighted)
29        myButton.layer.cornerRadius = 20.0
30        myButton.layer.position = CGPoint(x: self.view!.frame.width/2, y:200)
31        myButton.addTarget(self, action: #selector(onClickMyButton(sender:)), for: UIControlEvents.touchUpInside)
32        self.view?.addSubview(myButton)
33
34    }
35    
36    
37    @IBAction func button1(_ sender: UIButton)
38    {
39        animator?.removeAllBehaviors()
40        self.i = i+1
41        self.circle = SKShapeNode(circleOfRadius: 100)
42        self.circle.physicsBody = SKPhysicsBody(circleOfRadius: 100)
43        self.circle.fillColor = SKColor.white
44        self.circle.position = location
45        self.circle.physicsBody!.affectedByGravity = true
46        self.circle.physicsBody?.restitution = 0.5
47        self.physicsBody = SKPhysicsBody(edgeLoopFrom: self.frame)
48        self.circle.name = "Circle(String(i))"
49        self.circle.fillTexture = SKTexture(imageNamed: "Bubble.png")
50        self.circle.glowWidth = 5.0
51        self.circle.removeFromParent()
52        self.addChild(circle)
53    }
54    
55    @objc func onClickMyButton(sender:UIButton)
56    {
57        
58//            animator?.removeAllBehaviors()
59//            self.i = i+1
60//
61//            self.circle = SKShapeNode(circleOfRadius: 100)
62//            self.circle.physicsBody = SKPhysicsBody(circleOfRadius: 100)
63//            self.circle.fillColor = SKColor.white
64//            self.circle.position = location
65//            self.circle.physicsBody!.affectedByGravity = true
66//            self.circle.physicsBody?.restitution = 0.5
67//            self.physicsBody = SKPhysicsBody(edgeLoopFrom: self.frame)
68//            self.circle.name = "Circle(String(i))"
69//            self.circle.fillTexture = SKTexture(imageNamed: "Bubble.png")
70//            self.circle.glowWidth = 5.0
71//            self.circle.removeFromParent()
72//            self.addChild(circle)
73        
74//            self.myLabel = SKLabelNode(fontNamed:"Chalkduster")
75//            self.myLabel.text = "Hello, World!(String(i))";
76//            self.myLabel.fontSize = 20
77//            self.myLabel.position = circle.position
78//            self.myLabel.fontColor = UIColor.red
79//            self.myLabel.name = "myLabel(String(i))"
80//            self.myLabel.removeFromParent()
81//            circle.addChild(myLabel)
82    }
83    
84    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?)
85    {
86
87        for _ : AnyObject in touches
88        {
89            let location = touches.first!.location(in: self)
90            let node : SKNode? = self.atPoint(location)
91            print("Node Name: (String(describing: node?.name))")
92            if node?.name != nil
93            {
94                let location = touches.first!.location(in: self)
95                let node : SKNode? = self.atPoint(location)
96                _ = node?.name
97                if (node?.name?.contains("Circle"))!
98                {
99                    circle = node as! SKShapeNode
100                    print("Node Name: (String(describing: node?.name))")
101            
102                }
103            }
104        }
105        
106    }
107
108    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?)
109    {
110        for _ : AnyObject in touches
111        {
112            let location = touches.first!.location(in: self)
113            let node : SKNode? = self.atPoint(location)
114            if node?.name != nil
115            {
116                let location = touches.first!.location(in: self)
117                let action = SKAction.move(to: CGPoint(x:location.x, y:location.y), duration:0)
118                self.circle.physicsBody!.affectedByGravity = false
119                circle.run(action)
120            }
121        }
122    }
123    
124    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?)
125    {
126        let location = touches.first!.location(in: self)
127        let node : SKNode? = self.atPoint(location)
128        if node?.name != nil
129        {
130            animator?.removeAllBehaviors()
131            self.circle.physicsBody!.affectedByGravity = true
132            physicsWorld.gravity = CGVector(dx:0,dy:-7.0)
133        }
134        
135
136    }
137    
138    
139    override func update(_ currentTime: TimeInterval)
140    {
141    }
142    
143}
144