title: "executable not specified" error in PyCharm
body: <p>When I try to run a python script in PyCharm, I get this error message:</p>
  <blockquote>
  <p><code>error running myscript: Executable is not specified</code></p>
  </blockquote>
  <p>and the script does not run. How do I run my script through PyCharm?</p>