Unable to calculate FID score - ValueError: need at least one array to stack

[ashok-arora]

I ran this:

export KITTI360_DATASET=/home/cse/Desktop/ashok/lidar_kitty360/KITTI-360/    

followed by:
python lidargen.py --fid --exp kitti_pretrained --config kitti.yml python lidargen.py --fid --exp kitti_pretrained --config kitti.yml

and got the following traceback:

Traceback (most recent call last):
  File "lidargen.py", line 230, in <module>
    main()
  File "lidargen.py", line 170, in main
    fid_score = lidargen_fid.get_fid(folder1, folder2)
  File "/home/cse/Desktop/ashok/lidar_kitty360/lidargen/metrics/fid/lidargen_fid.py", line 50, in get_fid
    mu1, sigma1 = compute_stats(folder1, indices)
  File "/home/cse/Desktop/ashok/lidar_kitty360/lidargen/metrics/fid/lidargen_fid.py", line 37, in compute_stats
    all_activations = load_activations(load, indices)
  File "/home/cse/Desktop/ashok/lidar_kitty360/lidargen/metrics/fid/lidargen_fid.py", line 31, in load_activations
    all_activations = np.stack(all_arrays, axis=0)
  File "<__array_function__ internals>", line 5, in stack
  File "/home/cse/miniconda3/envs/lidar3/lib/python3.8/site-packages/numpy/core/shape_base.py", line 423, in stack
    raise ValueError('need at least one array to stack')
ValueError: need at least one array to stack

Am I doing something wrong?