question about run_grasp_test.py

[qqsq12321]

when I run run_grasp_test.py, I get the feedback like:
File "run_grasp_test.py", line 167, in
q_final_best = torch.cat(q_tra_best, dim=0)
RuntimeError: torch.cat(): expected a non-empty list of Tensors

how should I fix it? thanks for ur repeat at first!