title: Method (step) get a NotImplementedError in file A but in file B not
body: <p>I implemented step:  </p>
  
  <pre><code>@given('my step')
  def step_impl(context):
      somthing
  </code></pre>
  
  <p>In file fileA.py this method (step) get a NotImplementedError but if i moved this method to another file eg. fileB.py step is running properly.</p>
  
  <p>I don't know why and how can i fix it</p>