An error occurred while evaluating FID

[NCUCyy]

I am evaluating a pre-trained model with the given Humanml dataset and the following error occurs when calculating the FID metrics:
python -m eval.eval_humanml --model_path . /save/humanml_trans_enc_512/model000475000.pt

How can I fix this error?

========== Evaluating FID ==========
Traceback (most recent call last):
  File "/root/miniconda3/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/root/miniconda3/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/root/autodl-tmp/motion-diffusion-model/eval/eval_humanml.py", line 304, in <module>
    evaluation(eval_wrapper, gt_loader, eval_motion_loaders, log_file, replication_times, diversity_times, mm_num_times, run_mm=run_mm)
  File "/root/autodl-tmp/motion-diffusion-model/eval/eval_humanml.py", line 162, in evaluation
    fid_score_dict = evaluate_fid(eval_wrapper, gt_loader, acti_dict, f)
  File "/root/autodl-tmp/motion-diffusion-model/eval/eval_humanml.py", line 91, in evaluate_fid
    fid = calculate_frechet_distance(gt_mu, gt_cov, mu, cov)
  File "/root/autodl-tmp/motion-diffusion-model/data_loaders/humanml/utils/metrics.py", line 140, in calculate_frechet_distance
    raise ValueError('Imaginary component {}'.format(m))
ValueError: Imaginary component 0.04455859616772913