runtime error

Space not ready. Reason: Error, exitCode: 1, message: None

Container logs:

[nltk_data] Downloading package punkt to /home/user/nltk_data...
[nltk_data]   Unzipping tokenizers/punkt.zip.
Traceback (most recent call last):
  File "app.py", line 7, in <module>
    from IPython.display import HTML, display
ModuleNotFoundError: No module named 'IPython'