AttributeError: 'list' object has no attribute '_fields' code example

Example 1: AttributeError: 'Marshmallow' object has no attribute 'ModelSchema'

class UserSchema(ma.SQLAlchemyAutoSchema):
class Meta:
    model=User
    load_instance=True

Example 2: AttributeError: module 'tensorflow' has no attribute 'nn

I have solved this issue by downgrading the version of Tensorflow. 
Earlier I was using Tensorflow version 1.14.0. 
I installed Tensorflow version 1.13.2 and It solved my error.

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