"docker stop" requires at least 1 argument.
See 'docker stop --help'.

Usage:  docker stop [OPTIONS] CONTAINER [CONTAINER...]

Stop one or more running containers
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

100 12.1M  100 12.1M    0     0  34.9M      0 --:--:-- --:--:-- --:--:-- 34.9M
Creating network "healthcheck_default" with driver "bridge"
Pulling a1-sim-OSC (nexus3.o-ran-sc.org:10002/o-ran-sc/a1-simulator:2.1.0)...
Creating a1-sim-STD ... 
Creating policy-agent ... 
Creating a1-sim-STD-v2 ... 
Creating a1-sim-OSC    ... 
Creating a1-sim-OSC    ... done
Creating policy-agent  ... done
Creating a1-sim-STD-v2 ... done
Creating a1-sim-STD    ... done