Exception in thread "main" java.lang.NoClassDefFoundError: com/beust/jcommander/ParameterException
<p>I'm trying to run a very simple test using TestNG, but I'm getting this error message. I tried reading the previous answers, but it is not working to me. I would be happy if someone could help me out, since I'm just a beginner in TestNG. This is the error message :</p>

<blockquote>
  <p>Exception in thread "main" java.lang.NoClassDefFoundError:
  com/beust/jcommander/ParameterException</p>
</blockquote>