I can't quite figure out why when I run the code below I get the error message The function size() does not exist. When I comment out this code the sketch runs, but the words do not fade out.  

Any suggestions are very much appreciated! 

2. String words = "The sun is shining The weather is sweet Makes me want to move my dancing feet";
3. String[] list = split(words, ' ');
4. 
   
5. void setup() {
6. size(550,550);
7.   background(0);
8.   smooth();
9. 
   
10. }
11. 
    
12. //Draw a faint black rectangle over what is currently on the stage so it fades over time.
13. void draw() {
14.   fill(0,1);
15.   rect(0,0,width,height);
16. 
    
17. //Draw a word from the list of words
18. //int i = (frameCount % words.size());
19. //String words = words.get(i);
20.   
21.  //Put it somewhere random on the stage, with a random size and colour
22.   fill(255,random(50,150));
23.   textSize(random(10,30));
24.   text(words, random(width), random(height)); 
25.   
26. }