Problem with Eyelink average gaze (x and y) is always 0. iohub warning: Display / Monitor unit type has not been set

OS: Windows 10 pro
Psychopy version: 2022.1.4
Eyetracker: Eyelink

The eyetracker works, calibrates, time between fixations is shown, however the average gazes in x and y always return 0. Please help, code and output are shown below. (in file:preferences:general unit is set to “norm”)

code:
from psychopy import visual, core, gui, data, event
from psychopy.core import getTime
from psychopy.iohub import launchHubServer
from psychopy.iohub.constants import EventConstants
from time import sleep, time
import os
import os.path as op
import pickle
import matplotlib.pyplot as plt
import numpy as np
from random import shuffle

meds =
t1 = 10
t_ini=time()

iohub_config = {‘eyetracker.hw.gazepoint.gp3.EyeTracker’:
{‘name’: ‘tracker’, ‘device_timer’: {‘interval’: 0.005}}}

io = launchHubServer(**iohub_config)

t_stim =

tracker = io.devices.tracker
calib = tracker.runSetupProcedure()

timer = core.Clock()
tracker.setRecordingState(True)
t_stim.append(tracker.trackerTime())
stime = timer.getTime()
while timer.getTime()-stime < t1:
for evento in tracker.getEvents(EventConstants.FIXATION_END):
meds.append(evento)

tracker.setRecordingState(False)

gaze_d_x =
gaze_d_y =
tiempos =
for med in meds:
gaze_d_x.append(med.average_gaze_x)
gaze_d_y.append(med.average_gaze_y)
tiempos.append(med.device_time)
print(gaze_d_x,gaze_d_y,tiempos)

output:
*** iohub warning: Display / Monitor unit type has not been set.
[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] [279.2666, 279.2666, 279.52495999999996, 279.52495999999996, 279.89709999999997, 279.89709999999997, 280.17224, 280.17224, 280.59256, 280.59256, 281.12644, 281.12644, 281.35278999999997, 281.35278999999997, 282.04846, 282.04846, 282.48507, 282.48507, 283.05106, 283.05106, 283.26151, 283.26151, 283.61734, 283.61734, 284.03784, 284.03784, 284.47449, 284.47449, 284.74966, 284.74966, 285.05685, 285.05685, 285.41262, 285.41262, 285.73621, 285.73621, 285.97876, 285.97876, 286.31845999999996, 286.31845999999996, 286.65817, 286.65817, 287.19199, 287.19199, 287.48297, 287.48297, 288.30798000000004, 288.30798000000004, 288.56665, 288.56665, 288.84158, 288.84158]
ioHub Server Process Completed With Code: 0
################# Experiment ended with exit code 0 [pid:2328] #################