AttributeError: 'Mujoco' object has no attribute 'get_position'

[steroal]

Dear Pawel/Travis,
How to solve:
Traceback (most recent call last):
File "rover.py", line 293, in
net = demo(
File "rover.py", line 149, in demo
check_exit_and_track_data = nengo.Node(
File "/home/lst/anaconda3/envs/mujo/lib/python3.8/site-packages/nengo/base.py", line 34, in call
inst.init(*args, **kwargs)
File "/home/lst/anaconda3/envs/mujo/lib/python3.8/site-packages/nengo/node.py", line 209, in init
self.output = output # Must be set after size_out; may modify size_out
File "/home/lst/anaconda3/envs/mujo/lib/python3.8/site-packages/nengo/base.py", line 108, in setattr
super().setattr(name, val)
File "/home/lst/anaconda3/envs/mujo/lib/python3.8/site-packages/nengo/config.py", line 479, in setattr
super().setattr(name, val)
File "/home/lst/anaconda3/envs/mujo/lib/python3.8/site-packages/nengo/params.py", line 151, in set
self.data[instance] = self.coerce(instance, value)
File "/home/lst/anaconda3/envs/mujo/lib/python3.8/site-packages/nengo/node.py", line 77, in coerce
node.size_out = self.check_callable_output(node, output)
File "/home/lst/anaconda3/envs/mujo/lib/python3.8/site-packages/nengo/node.py", line 99, in check_callable_output
result, invoked = checked_call(output, *args)
File "/home/lst/anaconda3/envs/mujo/lib/python3.8/site-packages/nengo/utils/stdlib.py", line 199, in checked_call
return CheckedCall(func(*args, **kwargs), True)
File "rover.py", line 133, in check_exit_and_track_data
rover_xyz = interface.get_position("base_link")
AttributeError: 'Mujoco' object has no attribute 'get_position'
Thanks.