title: DOCPLEX does not work - CPLEX runtime not found
body: <p>I am facing an error like below, while I have installed docplex module and am using python 3.7/3.8. Would you please help me?</p>
  <pre><code>Traceback (most recent call last):
    File &quot;C:/Users/xxx/PycharmProjects/pythonProject/EPC _LTC.py&quot;, line 155, in &lt;module&gt;
      solution = mdl.solve(log_output=True)
    File &quot;C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\model.py&quot;, line 4222, in solve
      return self.fatal(&quot;CPLEX runtime not found: please install CPLEX or solve this model on DOcplexcloud&quot;)
    File &quot;C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\model.py&quot;, line 894, in fatal
      self._error_handler.fatal(msg, args)
    File &quot;C:\Users\xxx\PycharmProjects\pythonProject\venv\lib\site-packages\docplex\mp\error_handler.py&quot;, line 210, in fatal
      raise DOcplexException(resolved_message)
  docplex.mp.utils.DOcplexException: CPLEX runtime not found: please install CPLEX or solve this model on DOcplexcloud
  </code></pre>