Error in lesson 1 (using Clouderizer)

I get the following error under section improving model->data augmentation

OSError: Is a directory: data/dogscats/train/cats/.ipynb_checkpoints

I get the error when I run the cell
data = ImageClassifierData.from_paths(PATH, tfms=tfms)
learn = ConvLearner.pretrained(arch, data, precompute=True)

It got resolved on its own when I ran the code today.

I hit a similar error:
“Is a directory: data/dogscats/train/cats/.ipynb_checkpoints”
50% through my first resnet34 fitting:, 2) [cell #16 of lesson1.ipynb].
Problem sorted after removing the directory: