Hi, Thanks for the great book. I am trying to run _03_01_autoencoder_train.ipynb_ on Google Colaboratory. However, I am getting this error: ``` FileNotFoundError Traceback (most recent call last) <ipython-input-6-7a5d04d83c0d> in <module>() 7 8 if not os.path.exists(RUN_FOLDER): ----> 9 os.mkdir(RUN_FOLDER) 10 os.mkdir(os.path.join(RUN_FOLDER, 'viz')) 11 os.mkdir(os.path.join(RUN_FOLDER, 'images')) FileNotFoundError: [Errno 2] No such file or directory: 'run/vae/0001_digits' ``` What is going wrong here. [Here is a link to my file](https://colab.research.google.com/drive/1tm9cVcXlFy9iTVm3A9s5FliGih97J83u?usp=sharing).