Problem about Motors

i have also a problem about the motor. for example the following code:

import time
import pypot.robot
from poppy_humanoid.configuration.config import poppy_config
poppy = pypot.robot.from_config(poppy_config)
poppy.start_sync()
for m in poppy.motors:
m.compliant = False
for m in poppy.motors:
m.goto_position(0, 5)
time.sleep(5)

when i this code input, the robot legs don’t move. but the head, torso and arms move normally. i want to know what the possible problem.
In addition to this, i can’t also move a motor with the code for example

poppy.head_z.goal_position = 90.

i guess the possible problem is compliant. is right? or there is another problem?
Could you help me with that~
thanks~