how to run it successfully?

[Techhooli]

I use the llff dataset, but can't run it. what's the meaning of train_split, val_split, data_split_json in llff.yaml? Can you provide an example of data?
I run the scene "flowers" of llff dataset. And the dataset's structure is as follows.

When I run the dataset, the error happend in this place.

The error is as follows.

[Techhooli]

So this code try to create the val dataset from colmap results? Can you provide a small, runnable dataset? Thanks very much.