How to fix gif exportation ?

Hello, I'm a beginner in programmation, and I have made a small animation based on an existing one found in a book. I am now looking for exporting this animation into an animated gif, so I found this method :

http://p5art.tumblr.com/post/76979034572/exporting-sketches-as-animated-gifs-in-processing

The problem is, it doesn't seem to work. (I've already dowloaded the gifAnimation library for processing 3.0, it works on another sketch but not on this one) I keep getting, " unreachable code" and I can't get where I made a mistake. I suppose the GifExport lines are in the wrong place but I don't know how to fix it. So I am looking for some help on this forum haha :) I post the code here, if anyone can help :

import java.util.Calendar;
import processing.pdf.*;
import gifAnimation.*;

GifMaker gifExport;


int NORTH = 0;
int EAST = 1;
int SOUTH = 2;
int WEST = 3;

float posX, posY;
float posXcross, posYcross;

int direction = SOUTH;
float angleCount =1;   
float angle = getRandomAngle(direction);
float stepSize = 2; 
int minLength = 7; 
int dWeight = 100; 
int dStroke = 7;

int drawMode = 1;

void setup() {

  frameRate(60);

  size(1200, 700);
  colorMode(HSB, 360, 100, 100, 100);
  smooth();
  background(360);

  posX = int(random(0, width));
  posY = 0;
  posXcross = posX;
  posYcross = posY;

  noStroke();
  fill(359);
  rect(450, 250, 300, 200);

  gifExport = new GifMaker(this, “export.gif”);
  gifExport.setRepeat(0);
}

void draw() {
  for (int i=40; i<=mouseX; i++) {


    // ------ make step ------
    posX += cos(radians(angle)) * stepSize;
    posY += sin(radians(angle)) * stepSize;

    // ------ check if agent is near one of the display borders ------
    boolean reachedBorder = false;

    if (posY <= 1) {
      direction = SOUTH;
      reachedBorder = true;
    } else if (posX >= width-1) {
      direction = WEST;
      reachedBorder = true;
    } else if (posY >= height-1) {
      direction = NORTH;
      reachedBorder = true;
    } else if (posX <= 1) {
      direction = EAST;
      reachedBorder = true;
    }

    // ------ if agent is crossing his path or border was reached ------
    int px = (int) posX;
    int py = (int) posY;
    if (get(px, py) != color(360) || reachedBorder ) {
      angle = getRandomAngle(direction);
      float distance = dist(posX, posY, posXcross, posYcross);
      if (distance >= minLength) {
        strokeWeight(dWeight/50);
        if (drawMode == 1) stroke(0, 0, 0, 20);
        if (drawMode == 2) stroke( distance/dStroke, 70, 150);
        if (drawMode == 3) stroke(192, 100, 64, distance/dStroke);
        line(posX, posY, posXcross, posYcross);
      }
      posXcross = posX;
      posYcross = posY;
    }
  }
}

float getRandomAngle(int theDirection) {
  float a = (floor(random(-angleCount, angleCount)) + 0.5) * 90.0/angleCount;

  if (theDirection == NORTH) return (a - 90);
  if (theDirection == EAST) return (a);
  if (theDirection == SOUTH) return (a + 90);
  if (theDirection == WEST) return (a + 180);

  return 0;

  if (frameCount >=0 && frameCount<121) {
    gifExport.setDelay(5); // = speed of the animated GIF
    gifExport.addFrame();
  }
  if (frameCount>121) gifExport.finish();
}



void keyReleased() {
  if (key == DELETE || key == BACKSPACE) {
    background(360);
    noStroke();
    fill(359);
    rect(450, 250, 300, 200);
  }

  if (key == 's' || key == 'S') saveFrame(timestamp()+"_##.png");
  if (key == '1') drawMode = 1;
  if (key == '2') drawMode = 2;
  if (key == '3') drawMode = 3;
}

// timestamp
String timestamp() {
  Calendar now = Calendar.getInstance();
  return String.format("%1$ty%1$tm%1$td_%1$tH%1$tM%1$tS", now);
}

Thanks for your advice !