runtime error

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

Container logs:

Traceback (most recent call last):
  File "app.py", line 4, in <module>
    from utils import similarity
  File "/home/user/app/utils.py", line 8, in <module>
    from sklearn.decomposition import PCA
ModuleNotFoundError: No module named 'sklearn'