 <p>I think in your <code>django-shop/shop/money/__init__.py</code> rather than </p> <pre><code>from money_maker import MoneyMaker, AbstractMoney </code></pre> <p>you should either:</p> <pre><code> import .money_maker import MoneyMaker, AbstractMoney </code></pre> <p>or</p> <pre><code> import shop.money.money_maker import MoneyMaker, AbstractMoney </code></pre>