The size is not working

[pelesuka]

//import box2d physics engine
import shiffman.box2d.;
import org.jbox2d.common.;
import org.jbox2d.dynamics.joints.;
import org.jbox2d.collision.shapes.;
import org.jbox2d.collision.shapes.Shape;
import org.jbox2d.common.;
import org.jbox2d.dynamics.;
import org.jbox2d.dynamics.contacts.*;

Population pop;//the population of pool players
Box2DProcessing[] box2d;//each player needs an individual world so this array stores them
int popSize = 200;//the amount of players tested at once
table[] tables;//each player also needs a table
int speed = 60;//frameRate

boolean showSingle = false;//whether only one player needs to be shown because they are all the same
boolean saveFrames = true;//true if it the first gen after increasing the number of shots so it saves the full game not just the last shot
//------------------------------------------------------------------------------------------------------------------------------------------------------------------
void setup() {
size(400, 800);//this it the part not working
frameRate(speed);//set the initial frame rate

//initialise worlds and tables
box2d = new Box2DProcessing[popSize];
tables = new table[popSize];

for (int i = 0; i< box2d.length; i++) {//create each of the worlds and add a table to them
box2d[i] = new Box2DProcessing(this);
box2d[i].createWorld();
box2d[i].setGravity(0, 0);//no gravity
tables[i] = new table(box2d[i]);
}
pop = new Population(popSize);//create the population
}

//------------------------------------------------------------------------------------------------------------------------------------------------------------------
void draw() {
background(0, 200, 0);//green background
tables[0].show();//show the cushions and holes

if (pop.foundWinner) {//if one of the population has sunk all the balls then replay it and record it

if ((!pop.players[pop.bestPlayerNo].gameOver && !pop.players[pop.bestPlayerNo].won )|| !pop.players[pop.bestPlayerNo].ballsStopped()) {//while not done replaying
  box2d[pop.bestPlayerNo].step(); //step the world through time
  pop.players[pop.bestPlayerNo].update();//update the player
  pop.players[pop.bestPlayerNo].show(); // show the player
  saveFrame("output/15Ball/finalgame/frame_#######.png");//save the frame as an image
}

} else {//if solution not found
if (!pop.done()) {//while players still playing
stepBoxes();//step through time in the physics engine
pop.update();//update players
pop.show();//show balls
} else {
//genetic algorithm
pop.calculateFitness();
pop.setBestPlayer();//sets best player and checks if it won
if (!pop.foundWinner) {//if the best player didnt win

    if (pop.generation % 5 == 0) {//every 5 generation
      pop.resetPopulation();//set all the population as the best player then add one shot to the end of them
      showSingle = true;//only show one of the players
      saveFrames = true;//save all of the next game to show which shot was added to the end
    } else {
      pop.naturalSelection();//create new generation based on fitness 
      showSingle = true;//only show one of the players
    }
  }
}

}
}
//------------------------------------------------------------------------------------------------------------------------------------------------------------------
void keyPressed() {
switch(key) {
case '+'://increase game speed
speed+= 10;
frameRate(speed);
break;
case '-'://decrease game speed (to a min of 10)
if (speed>10) {
speed-= 10;
frameRate(speed);
}
break;
}
}
//------------------------------------------------------------------------------------------------------------------------------------------------------------------
void stepBoxes() { //step through time in all the boxes

for (int i = 0; i< box2d.length; i++) {
box2d[i].step();
}
}
//------------------------------------------------------------------------------------------------------------------------------------------------------------------
void resetWorlds() {//reset all the worlds to remove all the bodies from them
for (int i = 0; i< popSize; i++) {
box2d[i] = new Box2DProcessing(this);
box2d[i].createWorld();
box2d[i].setGravity(0, 0);
tables[i] = new table(box2d[i]);
}
}
After that is says size() cannot be used