returned non-zero exit status 1.

[talk2kabir]

Hello, Please why this error even after installing all the files as described in the READMe file.
..........................................................................................................................................................
Traceback (most recent call last):
File "tools/search_net.py", line 8, in
from fcos_core.utils.env import setup_environment # noqa F401 isort:skip
ModuleNotFoundError: No module named 'fcos_core'
Traceback (most recent call last):
File "/home/nie/anaconda3/envs/FAD/lib/python3.8/runpy.py", line 194, in _run_module_as_main
return _run_code(code, main_globals, None,
File "/home/nie/anaconda3/envs/FAD/lib/python3.8/runpy.py", line 87, in _run_code
exec(code, run_globals)
File "/home/nie/anaconda3/envs/FAD/lib/python3.8/site-packages/torch/distributed/launch.py", line 260, in
main()
File "/home/nie/anaconda3/envs/FAD/lib/python3.8/site-packages/torch/distributed/launch.py", line 255, in main
raise subprocess.CalledProcessError(returncode=process.returncode,
subprocess.CalledProcessError: Command '['/home/nie/anaconda3/envs/FAD/bin/python', '-u', 'tools/search_net.py', '--local_rank=0', '--skip-test', '--config-file', 'configs/fad/search/fad-fcos_imprv_R_50_FPN_1x.yaml', '--use-tensorboard', 'DATALOADER.NUM_WORKERS', '0', 'OUTPUT_DIR', 'training_dir/search/fad-fcos_imprv_R_50_FPN_1x']' returned non-zero exit status 1..

I would be grateful if you can help.
Thank you