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tbats and pmdarima import problem - tody18 - Aug-08-2019

I am trying to fit a tbats model and use the pmdarima library to find the best arima model for my time series analysis. In the first case i get the following error: No module named 'tbats' (from tbats import TBATS, BATS)
In the other one: 'numpy.ufunc size changed, may indicate binary incompatibility. Expected 216 from C header, got 192 from PyObject' (from pmdarima import auto_arima)

I have installed the libraries using pip install. Also when i run pip freeze the packages seem to exist but cannot be imported.
I am using Jupyter notebook. Any idea why this is happening? Thank you.