Cannot iterate through a dataloader

I get this error message: “Unable to open ‘hashtable_class_helper.pxi’: Unable to read file (Error: File not found (d:*\pandas_libs\hashtable_class_helper.pxi)).”
The code is as follows;

train_data_params = {‘batch_size’:512, ‘shuffle’:True, ‘num_workers’:0, ‘pin_memory’: True}
train_dataset = data.DataLoader(data_batch.train_dataset, **train_data_params)
for iter, batch in enumerate(train_dataset)

This seems to be an error message from pandas. Is this the full error message?
Could you iterate your Dataset (not DataLoader) once and make sure all keys are valid in your pandas dataframe?