co simulation with SUMO simulator

[goosebuums]

Hi, I am trying to co -simulate CARLA simulator with SUMO, which is traffic simulator made by eclipse.

However, I am reading the Document of SUMO-CARLA Co-simulation, which is written in:https://carla.readthedocs.io/en/latest/adv_sumo/

However, I am trying to spawn vehicles in both sumo and CARLA server, and tried to execute this line:

~/CARLA_0.9.13/Co-Simulation/Sumo$ python3 spawn_npc_sumo.py -n 10 --tls-manager carla --sumo-gui

and then press the play button in sumo, and no cars seems to appear and this thing appears in the terminal:

WARNING: Different landmarks controlling the same connection. Only one will be included.
WARNING: Different landmarks controlling the same connection. Only one will be included.
INFO: Starting new sumo server...
INFO: Remember to press the play button to start the simulation
Retrying in 1 seconds
/home/a/CARLA_0.9.13/Co-Simulation/Sumo/sumo_integration/sumo_simulation.py:297: FutureWarning: This search incorrectly ignores the root element, and will be fixed in a future version. If you rely on the current behaviour, change it to './/net-file'
tag = tree.find('//net-file')
/usr/lib/python3/dist-packages/requests/init.py:89: RequestsDependencyWarning: urllib3 (2.2.3) or chardet (3.0.4) doesn't match a supported version!
warnings.warn("urllib3 ({}) or chardet ({}) doesn't match a supported "
Traceback (most recent call last):
File "spawn_npc_sumo.py", line 300, in
main(args)
File "spawn_npc_sumo.py", line 117, in main
sumo_simulation = SumoSimulation(cfg_file,
File "/home/a/CARLA_0.9.13/Co-Simulation/Sumo/sumo_integration/sumo_simulation.py", line 336, in init
self.net = _get_sumo_net(cfg_file)
File "/home/a/CARLA_0.9.13/Co-Simulation/Sumo/sumo_integration/sumo_simulation.py", line 304, in _get_sumo_net
sumo_net = traci.sumolib.net.readNet(net_file)
AttributeError: module 'traci' has no attribute 'sumolib'

The last error word:module traci has no attribute sumolib..
how can I solve this prob?

my build environment is 20.04 ubuntu and carla0.9.13.

I have build SUMO by source. So, this should work if I have done everything properly.

I wonder how to fix this problem.

Thankyou.