I got this error when trying to integrate controlp5 into proscene based on controlp5 examples and examples from this forum. The error points out to the bold lines in the codes. I can't seem to solve this problem.

Can anyone help me on this please?

Thank you

the code i'm working on is 

2. import remixlab.proscene.*;
3. import java.util.HashMap;
4. import controlP5.*;
5. 
   
6. ControlP5 cp5;
7. controlP5.Button c0,c1;
8. 
   
9. 
   
10. Scene scene;
11. ArrayList stems;
12. int myColor;
13. Stem s0;
14. 
    
15. void setup() {
16.   size(800, 600, P3D);
17.   scene = new Scene(this);
18.   scene.setShortcut('f', Scene.KeyboardAction.DRAW_FRAME_SELECTION_HINT);
19.   cp5 = new ControlP5(this);
20.   createButtons();
21.   
22.   scene.setGridIsDrawn(true);
23.   scene.setCameraType(Camera.Type.ORTHOGRAPHIC);
24.   scene.setRadius(150);
25.   scene.showAll();
26.   s0 = new Stem(); 
27.   myColor = 130;
28.   stems = new ArrayList();
29.   addStem();
30.   
31. }
32. 
    
33. void draw() {
34.   background(0);
35.   drawScene();
36.   gui();
37. }
38. 
    
39. 
    
40. void addStem() {
41.   s0 = new Stem();
42.   stems.add(s0);
43. }
44. 
    
46. void drawScene() {
47.   // here goes your drawing code
49. for (int j = 0; j <stems.size(); j++) {
50.        Stem s0 = (Stem) stems.get(j);
51.        s0.draw(true);
52.  }
53. }
54. 
    
55. void createButtons(){
56.   c0 = cp5.addButton("c0")
57.     .setValue(1)
58.       .setPosition(20, 20)
59.         .setSize(100, 30)
60.           .setId(1);
61.   c1 = cp5.addButton("c1")
62.     .setValue(2)
63.       .setPosition(20, 60)
64.         .setSize(100, 30)
65.           .setId(1);
66.   cp5.setAutoDraw(false);
67. }
68. 
    
69. 
    
70. void gui() {
71.   saveState();
72.   // (2)
73.   // load a new font. ControlFont is a wrapper for processing's PFont
74.   // with processing 1.1 ControlFont.setSmooth() is not supported anymore.
75.   // to display a font as smooth or non-smooth, use true/false as 3rd parameter
76.   // when creating a PFont:
77. 
    
78.   PFont pfont = createFont("Arial", 20, true); // use true/false for smooth/no-smooth
79.   ControlFont font = new ControlFont(pfont, 241);
80. 
    
81.   // (3)
82.   // change the font and content of the captionlabels 
83.   // for both buttons create earlier.
84.   c0.captionLabel()
85.     .setFont(font)
86.       .setSize(20)
87.       .setText("add")
88.         ;
89. 
    
90.   c1.captionLabel()
91.     .setFont(font)
92.       .setSize(20)
93.       .setText("remove")
94.         ;  
95.   // (4)
96.   // adjust the location of a catiption label using the 
97.   // style property of a controller.
98.   c0.captionLabel()
99.     .getStyle()
100.       .marginLeft = 25;
101. 
     
102.   c1.captionLabel()
103.     .getStyle()
104.       .marginLeft = 3;
105.  
106.   
107.   cp5.draw();
108.   restoreState();
109. }
110. 
     
111. // properly hack to make it work
112. void saveState() {
113.   //  Set processing projection and modelview matrices to draw in 2D:
114.   // 1. projection matrix:
115.   float cameraZ = ((height/2.0f) / tan(PI*60.0f/360.0f));
116.   scene.pg3d.perspective(PI/3.0f, scene.camera().aspectRatio(), cameraZ/10.0f, cameraZ*10.0f);
117.   // 2 model view matrix
118.   scene.pg3d.camera();
119. }
120. 
     
121. void restoreState() {
122.   // 1. Restore processing projection matrix
123.   switch (scene.camera().type()) {
124.   case PERSPECTIVE:
125.     scene.pg3d.perspective(scene.camera().fieldOfView(), scene.camera().aspectRatio(), scene.camera().zNear(), scene.camera().zFar());
126.     break;
127.   case ORTHOGRAPHIC:
128.     float[] wh = scene.camera().getOrthoWidthHeight();
129.     scene.pg3d.ortho(-wh[0], wh[0], -wh[1], wh[1], scene.camera().zNear(), scene.camera().zFar());
130.     break;
131.   }
132.   // 2. Restore processing modelview matrix
133.   scene.pg3d.camera(scene.camera().position().x, scene.camera().position().y, scene.camera().position().z, scene.camera().at().x, scene.camera().at().y, scene.camera().at().z, scene.camera().upVector().x, scene.camera().upVector().y, scene.camera().upVector().z);
134. }
135. 
     
136. 
     
137. //functions for buttons
138. void c0(int theValue) {
139.   println("a button event. "+theValue);
140.   addStem();   
141. }
142. 
     
143. -------------------------------------------------------------------------------------------------------------------------
144. 
     
146. public class Stem {
147.   InteractiveFrame iFrame;
148.   float w, h, d;
149.   int c;
150.   float px, py, pz;
151.   float rx, ry, rz;
152.   int col;
153.     
154. 
     
155.   Stem() {
156.     iFrame = new InteractiveFrame(scene);
157.     setSize();
158.     setColor();
159.     setPosition();
160.     col = color(255);
161.     
162. 
     
163.   }
164.   
165.    public void draw() {
166.     draw(false);
167.   }
168.   
169.  public void draw(boolean drawAxis) {
170.     pushMatrix();
171.     pushStyle();
172.     iFrame.applyTransformation(); //optimum
173.     if(drawAxis) scene.drawAxis(max(w,h,d)*1.3f);
174.     noStroke();
175.     if (iFrame.grabsMouse()){
176.       fill(255, 0, 0);
177.     }
178.     else {
179.       fill(getColor());
180.     }
181.     stroke(col);
182.     sphere(10);
183. 
     
184.     popMatrix();
185.   }
186.   
187.    // sets size randomly
188.   public void setSize() {
189.     w = random(10, 40);
190.     h = random(10, 40);
191.     d = random(10, 40);
192.   }
193.   
194.   public void setSize(float myW, float myH, float myD) {
195.     w=myW; h=myH; d=myD;
196.   }
197.   
198.   public int getColor() {
199.     return c;
200.   }
201.   
202.   // sets color randomly
203.   public void setColor() {
204.     c = color(random(0, 255), random(0, 255), random(0, 255));
205.     }
206.   
207.   public void setColor(int myC) {
208.     c = myC;
209.   }
210.   
211.   public PVector getPosition() {
212.     return iFrame.position();
213.   }
214.   
215.   // sets position randomly
216.   public void setPosition() {
217.     float low = -100;
218.     float high = 100;
219.     iFrame.setPosition(new PVector(random(low, high), random(low, high), random(low, high)));
220.   }
221.   
222.   public void setPosition(PVector pos) {
223.     iFrame.setPosition(pos);
224.   }
225.   
226.   public Quaternion getOrientation() {
227.     return iFrame.orientation();
228.   }
229.   
230.   public void setOrientation(PVector v) {
231.     PVector to = PVector.sub(v, iFrame.position());
232.     iFrame.setOrientation(new Quaternion(new PVector(0,1,0), to));
233.   }
234. 
     
235. }