title: Why does my Makefile fails and how to fix 255 error for the Makefile?
body: <p>My <code>Makefile</code> is like below:</p>
  <pre><code>test:
      pipenv run test
  
  safety:
      pipenv run safety check --full-report
  </code></pre>
  <p>When I run the command <code>make safety</code>, I get the following error:</p>
  <pre><code>Makefile:5: recipe for target 'safety' failed
  make: *** [safety] Error 255
  </code></pre>
  <p>What does the 255 error mean and how to fix it? Why does only the second command raise an error?</p>