Program error seek help

[B-jack7]

When I follow the instructions to try to run Step3（optional）：python3 src/preprocess/get_bpe_data.py
I don't know what caused this. I have recompiled music_ bpe_ exec
The following error occurs：（）

Traceback (most recent call last):
File "src/preprocess/get_bpe_data.py", line 174,in merges,merged_vocs = load_before_apply_bpe(output_dir)
File "src/preprocess/get_bpe_data.py",line 93, in load_before_apply_bpea, b,ab = resort(a), resort(b), resort(a+b)
File "src/preprocess/get_bpe_data.py", line 22, in resortassert(len(voc） % 2 == 0),voc
AssertionError: 4

If you encounter the same mistake, can you share the solution.
thanks！