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I am trying to sort list of chats by time when was the last message in chat sent, but i am getting this error…

Does anyone know how to fix this, please?

@app.route('/my-chats', methods=['GET'])
    @login_required
    def my_chats():
        user = current_user
        chats = user.user_one_chats + user.user_two_chats
        chats = chats.order_by(Chats.last_message).all()
        return render_template('my_chats.html', chats=chats)

class Chats(db.Model):
      last_message = db.Column(db.DateTime, default = None)

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