mahimahi makes selenium not work

[aminuosii]

a command run in run_traces.py
" mm-delay 40 mm-link 12mbps ../cooked_traces/ATT-LTE-driving.down /home/zx/miniconda3/envs/tf/bin/python run_video.py 223.72.43.65 RL 320 0 ATT-LTE-driving.down 8"

it no work, and give me a seleniun error
Message: unknown error: Chrome failed to start: exited abnormally. (unknown error: DevToolsActivePort file doesn't exist) (The process started from chrome location /usr/bin/goole-chrome is no longer running, so Chromelriver is assuming that Chrome has crashed.

however, when I dont execute mm-delay 40 mm-link 12mbps ../cooked_traces/ATT-LTE-driving.down, just run /home/zx/miniconda3/envs/tf/bin/python run_video.py 223.72.43.65 RL 320 0 ATT-LTE-driving.down 8, the selenium worked!!!

So, I guess that mahimahi makes selenium not work, is my guess is correct? Thank you for your reply!