Recently, PyMongo 4.0 was released, which removes the Collection.remove() method. This method is called in wsgi.py, and breaks loading of data. I'm not a Mongo expert, and I haven't looked at what replaces the remove() method, but a simple fix is to pin PyMongo at <4.0. This forces installation of 3.12.3 (as I write this) and makes data loading work again.
Recently, PyMongo 4.0 was released, which removes the Collection.remove() method. This method is called in wsgi.py, and breaks loading of data. I'm not a Mongo expert, and I haven't looked at what replaces the remove() method, but a simple fix is to pin PyMongo at <4.0. This forces installation of 3.12.3 (as I write this) and makes data loading work again.