Generation of I2G data error

[Takase-Syunki]

Excuse me, when I try to generate I2G data with
python3 generate_I2G.py --real_im_pa dataset --batch_size 512 --out_size 256 --output_dir out
with FF++ dataset, the following error occurs The following error occurs.
The data used is a frame of a real image extracted from the FF++ dataset.
Do you know what the cause is?

-----error-----
ValueError: Sample larger than population or is negative

Could you please give me some advice on how to solve this? Thank！