EOFError due to multiprocess in PyCharm

[blmussati]

When running python run_group_ppo.py --algo ppo --use-gae --lr 2.5e-4 --clip-param 0.1 --value-loss-coef 0.5 --num-processes 4 --num-steps 128 --num-mini-batch 4 --log-interval 100 --use-linear-lr-decay --entropy-coef 0.01 --eval-interval 50 in the Python Console in PyCharm I get:

ERROR Traceback (most recent call last): File "evogym/examples/ppo/../utils/mp_group.py", line 7, in job_wrapper out_value = func(*args) File "evogym/examples/ppo/run.py", line 57, in run_ppo args.gamma, args.log_dir, device, False) File "evogym/examples/ppo/envs.py", line 97, in make_vec_envs envs = SubprocVecEnv(envs) File "/opt/anaconda3/envs/evogym/lib/python3.7/site-packages/stable_baselines3/common/vec_env/subproc_vec_env.py", line 111, in init observation_space, action_space = self.remotes[0].recv() File "/opt/anaconda3/envs/evogym/lib/python3.7/multiprocessing/connection.py", line 250, in recv buf = self._recv_bytes() File "/opt/anaconda3/envs/evogym/lib/python3.7/multiprocessing/connection.py", line 407, in _recv_bytes buf = self._recv(4) File "/opt/anaconda3/envs/evogym/lib/python3.7/multiprocessing/connection.py", line 383, in _recv raise EOFError EOFError

When I run the same command with --num-processes 1 I don't get any error and robots are evaluated using 1 episode.

Running the code through terminal doesn't give any problem.