addActiveSegment(seg) is not working

Hi! Just playing around with some rings i for some reason the function addActiveSegment(seg) does not work for me. Very easy sketch.

#include <WS2812FX.h>

#define LED_COUNT 32
#define LED_PIN 37
#define BUTTON_1 35

int enableStepper = 26;
int dirStepper = 23;
int stepStepper = 24;

#define RED        (uint32_t)0xFF0000
#define GREEN      (uint32_t)0x00FF00
#define BLUE       (uint32_t)0x0000FF
#define WHITE      (uint32_t)0xFFFFFF
#define BLACK      (uint32_t)0x000000
#define YELLOW     (uint32_t)0xFFFF00
#define CYAN       (uint32_t)0x00FFFF
#define MAGENTA    (uint32_t)0xFF00FF
#define PURPLE     (uint32_t)0x400080
#define ORANGE     (uint32_t)0xFF3000
#define PINK       (uint32_t)0xFF1493
#define GRAY       (uint32_t)0x101010
#define ULTRAWHITE (uint32_t)0xFFFFFFFF /* for RGBW LEDs */

WS2812FX ws2812fx = WS2812FX(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {

  pinMode(BUTTON_1, INPUT_PULLUP);

  ws2812fx.init();
  ws2812fx.setBrightness(255);

  for (int i=0; i <= 9; i++) {
    int firstLED = i*16;
    int lastLED = (i*16) + 15;
    ws2812fx.setIdleSegment(i, firstLED, lastLED, FX_MODE_BLINK, WHITE, 1000, NO_OPTIONS);
    ws2812fx.start();
  }
}

void loop() {
  ws2812fx.service();
  if (!digitalRead(BUTTON_1)) { 
    //ws2812fx.setSegment(0, 0, 15, FX_MODE_BLINK, GREEN, 100, NO_OPTIONS);        
    addActiveSegment(0);
  } 
 }

AppData\Local\Temp\arduino_modified_sketch_914290\Blink.ino: In function 'void setup()':
Blink:41:21: error: 'addActiveSegment' was not declared in this scope
   addActiveSegment(0);
                     ^
exit status 1
'addActiveSegment' was not declared in this scope

kitesurfer1404 / WS2812FX

addActiveSegment(seg) is not working #308