title: Akeneo 4: custom units of measure don't work
body: <p>I'm trying to import my custom units of measure into Akeneo 4 that I had created in Akeneo 3.2, but, after cleaning the cache, the app does not work.</p>
  <p>This is the tree of the bundle:
  <a href="https://i.stack.imgur.com/xRAIb.png" rel="nofollow noreferrer"> Bundle tree</a></p>
  <p>I activated the bundle in <em>conf/bundles.php:</em></p>
  <pre><code>&lt;?php
  
  return [
      // Add your bundles here with the associated env.
      // Ex:
      // Acme\Bundle\AppBundle\AcmeAppBundle::class =&gt; ['all' =&gt; true],
      Acme\Bundle\MyMeasureBundle\AcmeMyMeasureBundle::class =&gt; ['all' =&gt; true],
  ];
  </code></pre>
  <p>where is the error?</p>