Exception: Call project.prepare() first: in lesson3-rsna-pneumonia-detection-mdai-client-lib

[tobimichigan]

Hi there, I was testing lesson3-rsna-pneumonia-detection-mdai-client-lib, and encountered an issue on this sectionof the code:

train_dataset, valid_dataset = mdai.common_utils.train_test_split(dataset)

error encountered is as follows:

`Exception Traceback (most recent call last) in () ----> 1 train_dataset, valid_dataset = mdai.common_utils.train_test_split(dataset)

1 frames /usr/local/lib/python3.6/dist-packages/mdai/preprocess.py in get_image_ids(self, verbose) 296 """ 297 if not self.image_ids: --> 298 raise Exception("Call project.prepare() first.") 299 300 if verbose:

Exception: Call project.prepare() first.`

Meanwhile: dataset = p.get_dataset_by_id('D_VolK4E') dataset.prepare()

had already been executed.

Any clues?