Entering negative x, y, z values for move j results in TimeOut

[n-conq]

Trying to movej in a negative z direction results in the error below. Does anyone know why or how to fix it?

from urx import Robot
from time import sleep
import math3d as m3d

rob = Robot("169.254.1.2")

#tool center point (tcp) in (x,y,z,rx,ry,rz)
rob.set_tcp((0, 0, 0.1, 0, 0, 0))
#payload in (kg, (center of gravity x, cog y, cog z))
rob.set_payload(0.85, (0, 0, 0.1))
sleep(0.5)
x, y, z = 0, 0, -0.1
rx, ry, rz = 0, 0, 0
a, v = 0.1, 0.1
rob.movej((x, y, z, rx, ry, rz), a, v, relative= True, wait=True)

Exception in thread Thread-1:
Traceback (most recent call last):
File "C:\Users\Sophie\AppData\Local\Programs\Python\Python312\Lib\threading.py", line 1073, in _bootstrap_inner
Traceback (most recent call last):
File "c:\Users\Sophie\OneDrive\Desktop\Promotion\CryoTec\UR5_control", line 6, in
rob = Robot("169.254.1.2")
^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Sophie\AppData\Local\Programs\Python\Python312\Lib\site-packages\urx\robot.py", line 27, in init
URRobot.init(self, host, use_rt, use_simulation)
self.run()
File "C:\Users\Sophie\AppData\Local\Programs\Python\Python312\Lib\site-packages\urx\ursecmon.py", line 291, in run
data = self._get_data()
^^^^^^^^^^^^^^^^
File "C:\Users\Sophie\AppData\Local\Programs\Python\Python312\Lib\site-packages\urx\ursecmon.py", line 338, in _get_data
tmp = self._s_secondary.recv(1024)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TimeoutError: timed out
File "C:\Users\Sophie\AppData\Local\Programs\Python\Python312\Lib\site-packages\urx\urrobot.py", line 38, in init
self.secmon = ursecmon.SecondaryMonitor(self.host, use_simulation) # data from robot at 10Hz
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Sophie\AppData\Local\Programs\Python\Python312\Lib\site-packages\urx\ursecmon.py", line 257, in init
self.wait() # make sure we got some data before someone calls us
^^^^^^^^^^^
File "C:\Users\Sophie\AppData\Local\Programs\Python\Python312\Lib\site-packages\urx\ursecmon.py", line 349, in wait
raise TimeoutException("Did not receive a valid data packet from robot in {}".format(timeout))
urx.ursecmon.TimeoutException: Did not receive a valid data packet from robot in 0.5