Error when finetuning the model with MolTrain in unimol_tools

I gets this error when trying to finetune the model with
`clf = MolTrain(task='classification',
data_type='molecule',
epochs=30,
batch_size=64,
metrics='auc',
split='random',
learning_rate=1e-5,
save_path='./exp'
)
pred = clf.fit(datapath)`

My input csv has the same format as the demo in this repo (two columns named 'SMILES' and 'TARGET').

Could you suggest some possible reasons for this error?

Start by reproducing the shown MolTrain.fit call with the repository's demo-format CSV containing SMILES and TARGET columns. Inspect the MolTrain finetuning entry point and capture the complete error text from the image; done means identifying the cause and confirming that valid input can complete finetuning or that the issue is clearly documented.

Written by the indexing model from the issue text.